Register Now
 Register Now
 

You must sign in to add / modify vehicles in the EM garage
Fuel log graph
Efficiency log for: Z - 1977 Datsun 280Z 2+2 custom
  • Lifetime Fuel Economy: 36.1 mpg (US), 6.5 L/100 km, 43.4 mpg (Imp)
  • 90-day Fuel Economy: 31.9 mpg (US), 7.4 L/100 km, 38.3 mpg (Imp)
  • 3-tank Fuel Economy: 35.3 mpg (US), 6.7 L/100 km, 42.3 mpg (Imp)
  • EPA Combined Rating / % over rating: 22 mpg (US) / 44.8% (based on 90-day fuel economy)
  • Total fills: 54
  • Average cost per gal/L: $2.10 per gal (US); $0.00 per L (price data entered for 54 fill/s)
  • Average cost per fill: $11.85
  • Average distance cost: $0.06 per mi. / $0.03 per km
  • Total fuel used: 304.94 gal (US), 1154.3 L
  • Total distance traveled: 11467.2 mi. / 18454.6 km
  • Total cost: $639.82
  • Total fuel saved vs. EPA: 216.3 gal. (US) / 818.8 L
  • Total saved: $454.23 (based on avg. cost per gal./L)
  • Average tank distance: 212.4 mi. / 341.8 km
Fill date Distance Fill amount Price Fuel Economy Details
2010-11-13 131.6 mi
211.79 km
3.635 gal (US)
3.03 gal (Imp)
13.76 L
122.5 kWh
$3.4
($12.36 total for this fill)
36.2 mpg (US)
43.43 mpg (Imp)
6.5 L/100 km
2.76 gal (US)/100 mi
930.85 Wh/mi
city
2010-11-09 372.2 mi
599 km
10.49 gal (US)
8.73 gal (Imp)
39.71 L
353.51 kWh
$3.24
($33.99 total for this fill)
35.48 mpg (US)
42.63 mpg (Imp)
6.63 L/100 km
2.82 gal (US)/100 mi
949.79 Wh/mi
highway
2010-11-07 440.9 mi
709.56 km
12.71 gal (US)
10.58 gal (Imp)
48.11 L
428.33 kWh
$3.4
($43.21 total for this fill)
34.69 mpg (US)
41.67 mpg (Imp)
6.78 L/100 km
2.88 gal (US)/100 mi
971.49 Wh/mi
highway/freeway
2010-10-10 245.4 mi
394.93 km
6.812 gal (US)
5.67 gal (Imp)
25.79 L
229.56 kWh
$3.23
($22 total for this fill)
36.02 mpg (US)
43.28 mpg (Imp)
6.53 L/100 km
2.78 gal (US)/100 mi
935.45 Wh/mi
2010-07-31 427 mi
687.19 km
11.3 gal (US)
9.41 gal (Imp)
42.78 L
380.81 kWh
$2.96
($33.45 total for this fill)
37.79 mpg (US)
45.38 mpg (Imp)
6.23 L/100 km
2.65 gal (US)/100 mi
891.83 Wh/mi
roadtrip vancouver to eugene and back
2010-07-19 597.7 mi
961.9 km
15.23 gal (US)
12.68 gal (Imp)
57.65 L
513.25 kWh
$3.1
($47.21 total for this fill)
39.24 mpg (US)
47.14 mpg (Imp)
5.99 L/100 km
2.55 gal (US)/100 mi
858.71 Wh/mi
Long time off the road due to a fryed turbo bearing and no job. Got the turbo rebuilt, replaced #1 injector, and replaced all the u joints (all 6). First full tank of fuel since major maintenance, mostly short trips in city surface traffic.
2010-01-31 242.3 mi
389.94 km
6.354 gal (US)
5.29 gal (Imp)
24.05 L
214.13 kWh
$2.8
($17.79 total for this fill)
38.13 mpg (US)
45.8 mpg (Imp)
6.17 L/100 km
2.62 gal (US)/100 mi
883.74 Wh/mi
Polar Bear Cruise with the NW Z Club.
2010-01-29 27.87 mi
44.85 km
0.68 gal (US)
0.57 gal (Imp)
2.57 L
22.92 kWh
$3.1
($2.11 total for this fill)
40.99 mpg (US)
48.89 mpg (Imp)
5.73 L/100 km
2.44 gal (US)/100 mi
822.39 Wh/mi
BASELINE day run minimum electricity (everything off) 60-65 mph steady, no drafting, 1/2 way out from pump and back, topped to the neck at same pump, GPS average speed 51 mph (including on and off ramps and lights), temperature 47 F, altitude 100' ASL

Mile markers and odometer noted to calculate a K factor of 107.2% for tall tires. (for every 100 miles on the odometer the car has traveled 107.2 miles)

NORMALLY ASPIRATED Turbo piping disconnected at the intake (no filter, no ram air) Turbo waste gate locked open (minimum intake and exhaust restriction, no boost)

Note: the 2.335% reduction in fuel economy that occurs without the turbo connected.
2010-01-29 27.87 mi
44.85 km
0.664 gal (US)
0.55 gal (Imp)
2.51 L
22.38 kWh
$3.1
($2.06 total for this fill)
41.97 mpg (US)
50.67 mpg (Imp)
5.6 L/100 km
2.38 gal (US)/100 mi
803.01 Wh/mi
BASELINE day run minimum electricity (everything off) 60-65 mph steady, no drafting, 1/2 way out from pump and back, topped to the neck at same pump, GPS average speed 53 mph (including on and off ramps and lights), temperature 47 F, altitude 100' ASL

Mile markers and odometer noted to calculate a K factor of 107.2% for tall tires. (for every 100 miles on the odometer the car has traveled 107.2 miles)

Turbocharged and Intercooled, cruising with 1-2 PSI of boost.
2010-01-28 50.92 mi
81.95 km
1.283 gal (US)
1.07 gal (Imp)
4.86 L
43.24 kWh
$2.96
($3.8 total for this fill)
39.69 mpg (US)
47.59 mpg (Imp)
5.93 L/100 km
2.52 gal (US)/100 mi
849.18 Wh/mi
BASELINE 60-65 mph easy cruise up the freeway and back, night with headlights, wipers, heater fan, fuel line heaters and car stereo.

Fuel measured till pump handle kicked off.

Note: Electrical load represents a 5.432% reduction in fuel economy
2010-01-28 31.41 mi
50.55 km
0.826 gal (US)
0.69 gal (Imp)
3.13 L
27.84 kWh
$2.96
($2.44 total for this fill)
38.03 mpg (US)
45.52 mpg (Imp)
6.19 L/100 km
2.63 gal (US)/100 mi
886.34 Wh/mi
Disconnected the turbo compensation to the aneroid, seems to have cleared up a top end (full throttle) hiccup I was experiencing with it enabled. composite city highway driving with lots of heavy turbocharged acceleration.
2010-01-24 46.2 mi
74.35 km
1.33 gal (US)
1.11 gal (Imp)
5.03 L
44.82 kWh
$3.08
($4.1 total for this fill)
34.74 mpg (US)
41.62 mpg (Imp)
6.77 L/100 km
2.88 gal (US)/100 mi
970.13 Wh/mi
running a little rough, #1 injector might need service.
2010-01-24 256.2 mi
412.31 km
7.032 gal (US)
5.86 gal (Imp)
26.62 L
236.98 kWh
$2.89
($20.32 total for this fill)
36.43 mpg (US)
43.72 mpg (Imp)
6.46 L/100 km
2.74 gal (US)/100 mi
924.98 Wh/mi
to the coast and back, highway, electric heated injector lines, fixed injector line leaks, enabled turbo boost / fuel compensation.

closed up the front end for aerodynamics.
2010-01-07 510.2 mi
821.09 km
13.47 gal (US)
11.22 gal (Imp)
50.99 L
453.94 kWh
$2.8
($37.72 total for this fill)
37.88 mpg (US)
45.47 mpg (Imp)
6.21 L/100 km
2.64 gal (US)/100 mi
889.73 Wh/mi
around town city driving, lots of short trips
2009-11-25 166.5 mi
267.96 km
3.766 gal (US)
3.14 gal (Imp)
14.26 L
126.91 kWh
$2.89
($10.88 total for this fill)
44.21 mpg (US)
53.03 mpg (Imp)
5.32 L/100 km
2.26 gal (US)/100 mi
762.22 Wh/mi
freeway, non turbo compensated, fuel lift pump replaced FIXED
2009-10-28 526.9 mi
847.96 km
15.02 gal (US)
12.51 gal (Imp)
56.86 L
506.17 kWh
$2.94
($44.16 total for this fill)
35.08 mpg (US)
42.12 mpg (Imp)
6.71 L/100 km
2.85 gal (US)/100 mi
960.66 Wh/mi
city, with turbo compensator still enabled.
2009-10-15 199.6 mi
321.23 km
4.91 gal (US)
4.09 gal (Imp)
18.59 L
165.47 kWh
$2.78
($13.65 total for this fill)
40.65 mpg (US)
48.8 mpg (Imp)
5.79 L/100 km
2.46 gal (US)/100 mi
829.01 Wh/mi
freeway descending
2009-10-15 332.3 mi
534.79 km
9.022 gal (US)
7.51 gal (Imp)
34.15 L
304.04 kWh
$2.68
($24.18 total for this fill)
36.83 mpg (US)
44.25 mpg (Imp)
6.39 L/100 km
2.72 gal (US)/100 mi
914.96 Wh/mi
freeway climbing
2009-10-09 247.1 mi
397.67 km
6.413 gal (US)
5.34 gal (Imp)
24.28 L
216.12 kWh
$2.53
($16.22 total for this fill)
38.53 mpg (US)
46.27 mpg (Imp)
6.11 L/100 km
2.6 gal (US)/100 mi
874.63 Wh/mi
turbo compensator enabled for long term tests of its affect on the average.
2009-10-06 580 mi
933.42 km
17 gal (US)
14.16 gal (Imp)
64.35 L
572.9 kWh
$1.147
($19.5 total for this fill)
34.12 mpg (US)
40.96 mpg (Imp)
6.89 L/100 km
2.93 gal (US)/100 mi
987.76 Wh/mi
70% VO highway
2009-09-20 184.6 mi
297.08 km
5.13 gal (US)
4.27 gal (Imp)
19.42 L
172.88 kWh

($0.05 total for this fill)
35.98 mpg (US)
43.23 mpg (Imp)
6.54 L/100 km
2.78 gal (US)/100 mi
936.51 Wh/mi
freeway flying 80+ mph
2009-09-18 308.6 mi
496.64 km
8.224 gal (US)
6.85 gal (Imp)
31.13 L
277.15 kWh
$2.65
($21.79 total for this fill)
37.52 mpg (US)
45.05 mpg (Imp)
6.27 L/100 km
2.66 gal (US)/100 mi
898.09 Wh/mi
freeway flying 80+
2009-09-16 557.8 mi
897.69 km
15 gal (US)
12.49 gal (Imp)
56.78 L
505.5 kWh
$2.76
($41.4 total for this fill)
37.19 mpg (US)
44.66 mpg (Imp)
6.33 L/100 km
2.69 gal (US)/100 mi
906.24 Wh/mi
freeway flying city blend
2009-09-13 876.4 mi
1410.43 km
22.25 gal (US)
18.53 gal (Imp)
84.23 L
749.83 kWh
$2.06
($45.84 total for this fill)
39.39 mpg (US)
47.3 mpg (Imp)
5.97 L/100 km
2.54 gal (US)/100 mi
855.58 Wh/mi
2009-08-28 311.7 mi
501.63 km
8.75 gal (US)
7.29 gal (Imp)
33.12 L
294.88 kWh

($0.09 total for this fill)
35.62 mpg (US)
42.76 mpg (Imp)
6.6 L/100 km
2.81 gal (US)/100 mi
946.04 Wh/mi
20% VO composite freeway/highway/city
2009-08-17 359.5 mi
578.56 km
9.36 gal (US)
7.79 gal (Imp)
35.43 L
315.43 kWh
$2.59
($24.24 total for this fill)
38.41 mpg (US)
46.15 mpg (Imp)
6.12 L/100 km
2.6 gal (US)/100 mi
877.41 Wh/mi
45% VO highway over brian head twice
2009-08-13 71.5 mi
115.07 km
1.9 gal (US)
1.58 gal (Imp)
7.19 L
64.03 kWh

($0.02 total for this fill)
37.63 mpg (US)
45.25 mpg (Imp)
6.25 L/100 km
2.66 gal (US)/100 mi
895.52 Wh/mi
45% VO delta to milford highway
2009-08-13 63.7 mi
102.52 km
1.411 gal (US)
1.17 gal (Imp)
5.34 L
47.55 kWh
$2.8
($3.95 total for this fill)
45.15 mpg (US)
54.44 mpg (Imp)
5.21 L/100 km
2.22 gal (US)/100 mi
746.47 Wh/mi
55% VO Filmore to Delta highway
2009-08-13 60.4 mi
97.2 km
1.232 gal (US)
1.03 gal (Imp)
4.66 L
41.52 kWh
$2.52
($3.1 total for this fill)
49.03 mpg (US)
58.64 mpg (Imp)
4.79 L/100 km
2.04 gal (US)/100 mi
687.42 Wh/mi
65% VO beaver to filmore freeway
2009-08-13 31.7 mi
51.02 km
0.918 gal (US)
0.77 gal (Imp)
3.48 L
30.94 kWh
$2.62
($2.41 total for this fill)
34.53 mpg (US)
41.17 mpg (Imp)
6.82 L/100 km
2.9 gal (US)/100 mi
976.03 Wh/mi
75% VO milford to beaver highway
I added vortex generators on the leading edge of the hood and roof, and along rear quarter windows.
2009-08-06 50.5 mi
81.27 km
0.902 gal (US)
0.75 gal (Imp)
3.41 L
30.4 kWh
$2.59
($2.34 total for this fill)
55.99 mpg (US)
67.33 mpg (Imp)
4.2 L/100 km
1.79 gal (US)/100 mi
601.98 Wh/mi
85% VO highway (strong tailwind 30+ mph)
2009-08-05 31.3 mi
50.37 km
0.695 gal (US)
0.58 gal (Imp)
2.63 L
23.42 kWh
$2.59
($1.8 total for this fill)
45.04 mpg (US)
53.97 mpg (Imp)
5.22 L/100 km
2.22 gal (US)/100 mi
748.24 Wh/mi
100% VO highway
2009-08-04 31.3 mi
50.37 km
0.68 gal (US)
0.57 gal (Imp)
2.57 L
22.92 kWh
$2.59
($1.76 total for this fill)
46.03 mpg (US)
54.91 mpg (Imp)
5.1 L/100 km
2.17 gal (US)/100 mi
732.27 Wh/mi
2009-08-04 335.9 mi
540.58 km
10 gal (US)
8.33 gal (Imp)
37.85 L
337 kWh

($0.1 total for this fill)
33.59 mpg (US)
40.32 mpg (Imp)
7 L/100 km
2.98 gal (US)/100 mi
1003.27 Wh/mi
65% vo las vegas to milford uphill freeway
2009-07-31 187.2 mi
301.27 km
4.31 gal (US)
3.59 gal (Imp)
16.32 L
145.25 kWh
$2.56
($11.03 total for this fill)
43.43 mpg (US)
52.14 mpg (Imp)
5.42 L/100 km
2.3 gal (US)/100 mi
775.91 Wh/mi
95% vo cedar to las vegas downhill freeway
2009-07-31 56.2 mi
90.45 km
1.447 gal (US)
1.21 gal (Imp)
5.48 L
48.76 kWh
$2.55
($3.69 total for this fill)
38.84 mpg (US)
46.45 mpg (Imp)
6.06 L/100 km
2.57 gal (US)/100 mi
867.62 Wh/mi
100% vo milford to cedar highway, I added headlight bucket aerodynamic lens covers.
2009-07-30 29.3 mi
47.15 km
0.8 gal (US)
0.67 gal (Imp)
3.03 L
26.96 kWh
$2.6
($2.08 total for this fill)
36.63 mpg (US)
43.73 mpg (Imp)
6.43 L/100 km
2.73 gal (US)/100 mi
920.14 Wh/mi
100% VO
2009-07-27 624.5 mi
1005.04 km
15 gal (US)
12.49 gal (Imp)
56.78 L
505.5 kWh

($0.15 total for this fill)
41.63 mpg (US)
50 mpg (Imp)
5.65 L/100 km
2.4 gal (US)/100 mi
809.45 Wh/mi
75% VO highway 65mph / freeway 75mph road trip
2009-07-22 119.9 mi
192.96 km
3.311 gal (US)
2.76 gal (Imp)
12.53 L
111.58 kWh
$2.58
($8.54 total for this fill)
36.21 mpg (US)
43.44 mpg (Imp)
6.49 L/100 km
2.76 gal (US)/100 mi
930.61 Wh/mi
75% VO composite with much spirited acceleration showing the car off to family and friends
2009-07-20 177.7 mi
285.98 km
4.456 gal (US)
3.71 gal (Imp)
16.87 L
150.17 kWh
$2.6
($11.59 total for this fill)
39.88 mpg (US)
47.9 mpg (Imp)
5.9 L/100 km
2.51 gal (US)/100 mi
845.08 Wh/mi
high speed freeway 100% vo
2009-07-20 333.4 mi
536.56 km
8.3 gal (US)
6.91 gal (Imp)
31.42 L
279.71 kWh

($0.08 total for this fill)
40.17 mpg (US)
48.25 mpg (Imp)
5.86 L/100 km
2.49 gal (US)/100 mi
838.96 Wh/mi
composite highway city 100% VO
2009-07-13 11.5 mi
18.51 km
0.275 gal (US)
0.23 gal (Imp)
1.04 L
9.27 kWh
$2.59
($0.71 total for this fill)
41.82 mpg (US)
50 mpg (Imp)
5.62 L/100 km
2.39 gal (US)/100 mi
806.09 Wh/mi
electronic advance test run, 100% VO @ 160F+, @ 60mph
Datum, electronic advance solenoid ENERGIZED
NOTE: I made two identical runs back to back to the same turnaround on the highway and had two different reading on the odometer an error of about 16.5% I will need to investigate this error and it explains the spread in fuel mileage I am recording. I will be adding a calibrated bicycle computer to get more accurate results.
2009-07-13 9.6 mi
15.45 km
0.279 gal (US)
0.23 gal (Imp)
1.06 L
9.4 kWh
$2.59
($0.72 total for this fill)
34.41 mpg (US)
41.74 mpg (Imp)
6.86 L/100 km
2.91 gal (US)/100 mi
979.17 Wh/mi
electronic advance test run, 100% VO @ 160F+, @ 60mph
Datum, electronic advance selonoid NOT energized
2009-07-10 35.8 mi
57.61 km
1 gal (US)
0.83 gal (Imp)
3.79 L
33.7 kWh
35.8 mpg (US)
43.13 mpg (Imp)
6.58 L/100 km
2.79 gal (US)/100 mi
941.34 Wh/mi
datum, milford to minersville to milford 55 mph 100% VO
2009-07-10 205.6 mi
330.88 km
6 gal (US)
5 gal (Imp)
22.71 L
202.2 kWh

($0.06 total for this fill)
34.27 mpg (US)
41.12 mpg (Imp)
6.86 L/100 km
2.92 gal (US)/100 mi
983.46 Wh/mi
Cedar city over brian head to kanab back over brian head to milford on 75% unheated VO at a steady state 60 mph. Includes a few miles of errand and several spirited romps on the turbo.
2009-07-06 54.2 mi
87.23 km
1.373 gal (US)
1.14 gal (Imp)
5.2 L
46.27 kWh
$2.55
($3.5 total for this fill)
39.48 mpg (US)
47.54 mpg (Imp)
5.96 L/100 km
2.53 gal (US)/100 mi
853.69 Wh/mi
milford to cedar city on 75% Unheated VO (vegitable oil) at a steady state 60mph. VO heater needs to be added, tis on order. Trip includes a few miles of short run errands in milford.
2009-07-05 313.3 mi
504.21 km
9.05 gal (US)
7.54 gal (Imp)
34.26 L
304.99 kWh
$1.71
($15.48 total for this fill)
34.62 mpg (US)
41.55 mpg (Imp)
6.79 L/100 km
2.89 gal (US)/100 mi
973.48 Wh/mi
milford to mesquite and back, on 1/3 vegetable oil 2/3 diesel at full freeway speed + (about 80 mph)

note: I was able to maintian 80 mph up any grade on this road at part throttle, and I was able to accelerate respectably up these grades.

Pyrometer showed the following exhaust temperatures:
Idle 200-300F
cruise 450-550F
climb 600-900F

I have not yet seen EGT's past 800F which is good for the valves :-)
2009-07-05 208.8 mi
336.03 km
6.004 gal (US)
5 gal (Imp)
22.73 L
202.33 kWh

($0.06 total for this fill)
34.78 mpg (US)
41.76 mpg (Imp)
6.76 L/100 km
2.88 gal (US)/100 mi
969.01 Wh/mi
General around town B-bop with a few short highway trips and a trip to cedar.

I can see how enjoying the Brisk acceleration consumes much greater fuel.

Put the big clutch fan back on for cooling (need a sheet of aluminum to install the electric fan I have)
2009-06-23 74.6 mi
120.06 km
1.865 gal (US)
1.55 gal (Imp)
7.06 L
62.85 kWh
$2.49
($4.64 total for this fill)
40 mpg (US)
48.13 mpg (Imp)
5.88 L/100 km
2.5 gal (US)/100 mi
842.49 Wh/mi
return from cedar city normal highway pace, night, windows down high beams on
2009-06-22 55.3 mi
89 km
1.099 gal (US)
0.92 gal (Imp)
4.16 L
37.04 kWh
$2.54
($2.79 total for this fill)
50.32 mpg (US)
60.11 mpg (Imp)
4.67 L/100 km
1.99 gal (US)/100 mi
669.8 Wh/mi
milford to cedar city from 5000' over one pass at 6750' manifold pressure aneroid disconnected 60 mph steady.
2009-06-08 88.4 mi
142.27 km
2.362 gal (US)
1.97 gal (Imp)
8.94 L
79.6 kWh
$2.499
($5.9 total for this fill)
37.43 mpg (US)
44.87 mpg (Imp)
6.28 L/100 km
2.67 gal (US)/100 mi
900.45 Wh/mi
from parowan to cedar city composite highway / city with a couple fun stabs to the turbo with my toe shoping and girl watching, then from cedar city back to milford on a highway at 70 over a mountain pass.
2009-06-08 34.2 mi
55.04 km
0.989 gal (US)
0.82 gal (Imp)
3.74 L
33.33 kWh
$2.469
($2.44 total for this fill)
34.58 mpg (US)
41.71 mpg (Imp)
6.8 L/100 km
2.89 gal (US)/100 mi
974.56 Wh/mi
from beaver to parowan steady state at 85 mph over a mountain pass on the freeway
2009-06-08 32.6 mi
52.46 km
0.883 gal (US)
0.73 gal (Imp)
3.34 L
29.76 kWh
$2.439
($2.15 total for this fill)
36.92 mpg (US)
44.66 mpg (Imp)
6.37 L/100 km
2.71 gal (US)/100 mi
912.88 Wh/mi
Intercooler added first road trip with full 7psi turbo boost available,

from milford to beaver at a 60 mph steady state
mostly level highway, with a 500 foot ascent in altitude overall
2009-06-01 80 mi
128.75 km
1.739 gal (US)
1.45 gal (Imp)
6.58 L
58.6 kWh
$2.39
($4.16 total for this fill)
46 mpg (US)
55.17 mpg (Imp)
5.11 L/100 km
2.17 gal (US)/100 mi
732.5 Wh/mi
This was the maiden voyage and stress test of the new powertrain.

With my toes in the turbo I climbed from cedar city utah @5000' in altitude to over 10,000' altitude over Brian Head to Kanab at fastest safe speed staying between 60 and 70 mph except in the switchbacks.

With the cars 17.5 gallon tank that is a 800 mile range under these conditions.

Next time I will slow it down on the flats to get you the other end of the spectrum.

View: spreadsheet friendly fuel log output (for copy/paste)


sig image



Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com