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Fuel log graph
Efficiency log for: Optima - 2012 Kia Optima LX Manual
  • Lifetime Fuel Economy: 39 mpg (US), 6 L/100 km, 46.8 mpg (Imp)
  • 90-day Fuel Economy: 37.7 mpg (US), 6.2 L/100 km, 45.3 mpg (Imp)
  • 3-tank Fuel Economy: 39 mpg (US), 6 L/100 km, 46.9 mpg (Imp)
  • EPA Combined Rating / % over rating: 28 mpg (US) / 34.6% (based on 90-day fuel economy)
  • Total fills: 30
  • Average cost per gal/L: $4.77 per gal (US); $1.26 per L (price data entered for 30 fill/s)
  • Average cost per fill: $70.71
  • Average distance cost: $0.12 per mi. / $0.08 per km
  • Total fuel used: 446.29 gal (US), 1689.4 L
  • Total distance traveled: 17411.6 mi. / 28021.3 km
  • Total cost: $2,121.30
  • Total fuel saved vs. EPA: 175.6 gal. (US) / 664.7 L
  • Total saved: $837.61 (based on avg. cost per gal./L)
  • Average tank distance: 580.4 mi. / 934 km
Fill date Distance Fill amount Price Fuel Economy Details
2013-07-26 879 km
546.19 mi
59.05 L
15.6 gal (US)
12.99 gal (Imp)
525.72 kWh
$1.33
($78.54 total for this fill)
6.72 L/100 km
35.01 mpg (US)
42.05 mpg (Imp)
2.86 gal (US)/100 mi
962.52 Wh/mi
last tank was husky, higher alcohol I think, avg speed 64km/hr
2013-07-16 1067 km
663 mi
62.36 L
16.47 gal (US)
13.72 gal (Imp)
555.04 kWh
$1.32
($82.32 total for this fill)
5.84 L/100 km
40.26 mpg (US)
48.32 mpg (Imp)
2.48 gal (US)/100 mi
837.16 Wh/mi
2013-06-20 1105 km
686.62 mi
62.5 L
16.51 gal (US)
13.75 gal (Imp)
556.39 kWh
$1.29
($80.63 total for this fill)
5.66 L/100 km
41.59 mpg (US)
49.94 mpg (Imp)
2.4 gal (US)/100 mi
810.33 Wh/mi
2013-06-08 1105 km
686.62 mi
62.5 L
16.51 gal (US)
13.75 gal (Imp)
556.39 kWh
$1.29
($80.63 total for this fill)
5.66 L/100 km
41.59 mpg (US)
49.94 mpg (Imp)
2.4 gal (US)/100 mi
810.33 Wh/mi
2013-05-17 1139 km
707.74 mi
63.29 L
16.72 gal (US)
13.92 gal (Imp)
563.46 kWh
$1.28
($81.01 total for this fill)
5.56 L/100 km
42.33 mpg (US)
50.84 mpg (Imp)
2.36 gal (US)/100 mi
796.14 Wh/mi
2013-05-02 645 km
400.78 mi
30.54 L
8.07 gal (US)
6.72 gal (Imp)
271.96 kWh
$1.22
($37.26 total for this fill)
4.73 L/100 km
49.66 mpg (US)
59.64 mpg (Imp)
2.01 gal (US)/100 mi
678.58 Wh/mi
Damn rounding doesn't give me the 50MPG!!!

filled up just past 1/2 tank when I switched from winter (2156516 in LRR michelin xice2) to summer 17in heavier 2355517 nankang.

Best mpg yet so far, thanks to the warmer weather. Also this tank was half Esso half Petro Canada gas. I think th Esso might be a better blend as I noticed a mpg bump shortly after putting it in but maybe it was just the warmer weather. The next tank will be all Esso to compare both on the same wheels.
2013-04-07 1176 km
730.73 mi
60.29 L
15.93 gal (US)
13.26 gal (Imp)
536.84 kWh
$1.21
($72.95 total for this fill)
5.13 L/100 km
45.87 mpg (US)
55.11 mpg (Imp)
2.18 gal (US)/100 mi
734.66 Wh/mi
Last 1/3 of the tank was a road trip, mostly up hill on the way up, filled up half way on the trip back. Filled up with Esso brand gas for the next tank.

Highest KM tank ever and I filled up as soon as the light came on. I could have easily broken 1250 before filling up. It's nice that the warmer weather was here.
2013-04-07 1041 km
646.85 mi
62.86 L
16.61 gal (US)
13.83 gal (Imp)
559.76 kWh
$1.25
($78.58 total for this fill)
6.04 L/100 km
38.94 mpg (US)
46.77 mpg (Imp)
2.57 gal (US)/100 mi
865.36 Wh/mi
56km/hr avg speed, it's getting warmer, lower grill block has been fully on and 10% off mix for most of the tank. Warm air intake has been working pretty well, avg temp prob. about +2 C.
2013-03-22 971 km
603.35 mi
63.61 L
16.8 gal (US)
13.99 gal (Imp)
566.16 kWh
$1.31
($83.33 total for this fill)
6.55 L/100 km
35.91 mpg (US)
43.13 mpg (Imp)
2.78 gal (US)/100 mi
938.36 Wh/mi
2013-03-05 1048 km
651.2 mi
67.87 L
17.93 gal (US)
14.93 gal (Imp)
604.24 kWh
$1.3
($88.23 total for this fill)
6.48 L/100 km
36.32 mpg (US)
43.62 mpg (Imp)
2.75 gal (US)/100 mi
927.89 Wh/mi
2013-02-21 1031 km
640.63 mi
66.25 L
17.5 gal (US)
14.57 gal (Imp)
589.75 kWh
$1.34
($88.78 total for this fill)
6.43 L/100 km
36.61 mpg (US)
43.97 mpg (Imp)
2.73 gal (US)/100 mi
920.58 Wh/mi
2013-02-06 1082 km
672.32 mi
68.37 L
18.06 gal (US)
15.04 gal (Imp)
608.62 kWh
$1.31
($89.56 total for this fill)
6.32 L/100 km
37.23 mpg (US)
44.7 mpg (Imp)
2.69 gal (US)/100 mi
905.25 Wh/mi
2013-01-18 775.5 km
481.87 mi
41.974 L
11.09 gal (US)
9.23 gal (Imp)
373.73 kWh
$1.21
($50.79 total for this fill)
5.41 L/100 km
43.45 mpg (US)
52.21 mpg (Imp)
2.3 gal (US)/100 mi
775.58 Wh/mi
5.5 l/100 on display, 55km/hr avg. Had a battery issue last night with EOC to a stop light and couldn't restart, -11C, had recently replaced a dead headlight bulb so I'm back at 2 maybe that was why I hadn't had any issues all winter. I'll be changing my habits and experimenting with a steady 90km/hr on the highway and only EOC on downhill sections. This will ensure my battery is completely topped off so I can EOC P and G for my city driving.

I didn't do a full tank because I'll be making that switch to the next tank, after that one drive home at a steady 90km/hr I got 5.1l/100 displayed which is what I avg with P&G, best P&G trip recently was 4.7 but some are 5.5+.
2013-01-05 1129.8 km
702.03 mi
64.369 L
17 gal (US)
14.16 gal (Imp)
572.9 kWh
$1.19
($76.6 total for this fill)
5.7 L/100 km
41.3 mpg (US)
49.58 mpg (Imp)
2.42 gal (US)/100 mi
816.06 Wh/mi
5.8l/100 displayed by car, 58km/hr avg, avg temp est 0 to -5C.
2012-12-12 1024 km
636.28 mi
60.74 L
16.05 gal (US)
13.36 gal (Imp)
540.89 kWh
$1.17
($71.07 total for this fill)
5.93 L/100 km
39.64 mpg (US)
47.63 mpg (Imp)
2.52 gal (US)/100 mi
850.08 Wh/mi
filled up at a different gas station (petro canada gas for the next tank).

6.0l/100 on car display, 45km/hr avg speed.
2012-11-27 1114.19 km
692.33 mi
62.14 L
16.42 gal (US)
13.67 gal (Imp)
553.35 kWh
$1.21
($75.19 total for this fill)
5.58 L/100 km
42.16 mpg (US)
50.65 mpg (Imp)
2.37 gal (US)/100 mi
799.26 Wh/mi
5.8l/100 on display. 53km/hr avg speed. Around 0 celcious full lower grill block. Low intake temps but one day temp outside went up and intake temp around 40c showed a good FE improvement so im going to work on a warm air duct for the intake. I already removed the cold portion and let the intake pick up from the centre of the engine bay.
2012-11-08 1086 km
674.81 mi
62.53 L
16.52 gal (US)
13.75 gal (Imp)
556.72 kWh
$1.23
($76.91 total for this fill)
5.76 L/100 km
40.85 mpg (US)
49.08 mpg (Imp)
2.45 gal (US)/100 mi
825 Wh/mi
2012-10-26 325 km
201.95 mi
17.9 L
4.73 gal (US)
3.94 gal (Imp)
159.4 kWh
$1.15
($20.59 total for this fill)
5.51 L/100 km
42.7 mpg (US)
51.26 mpg (Imp)
2.34 gal (US)/100 mi
789.3 Wh/mi
2012-10-20 970.1 km
602.79 mi
58.1 L
15.35 gal (US)
12.78 gal (Imp)
517.3 kWh
$1.19
($69.14 total for this fill)
5.99 L/100 km
39.27 mpg (US)
47.17 mpg (Imp)
2.55 gal (US)/100 mi
858.18 Wh/mi
53km/hr avg, computer display said 6.3. Full tank on new EOC kill switch wired to computer instead of ignition, lose the VSS while killing but I figure that millage is insignificant.

first 1/4 of the tank with my cargo carrier on, computer saying about 6.0, 1/2 without and computer was saying 6.6. Put it back on for the last 1/4 and it dropped to 6.3. I am surprised but it is a fuel economy mod!

Cold weather was really hurting my millage too, played around with partial and full lower grill blocks, temps still shot up to 20+ in the day so I couldn't do full lower, at under 10 all the time I think full lower will be safe.

Took off the first part of the intake that scoops in fresh air so now it intakes front the centre of the engine bay. That got my intake air temp up a bit, not sure if it helped FE.

Winter tires will be going on next tank.
2012-10-07 1109 km
689.1 mi
61.455 L
16.23 gal (US)
13.52 gal (Imp)
546.95 kWh
$1.3
($79.89 total for this fill)
5.54 L/100 km
42.46 mpg (US)
50.97 mpg (Imp)
2.36 gal (US)/100 mi
793.72 Wh/mi
Changed my kill switch right near the end of the tank. That reset my computer so I lost avg speed and displayed avg l/100 for the tank. Added a 75% lower grill block. Kept the cargo carrier hitch mount on for 80% of the tank.
2012-09-16 1061 km
659.27 mi
66.561 L
17.58 gal (US)
14.64 gal (Imp)
592.45 kWh
$1.31
($87.19 total for this fill)
6.27 L/100 km
37.5 mpg (US)
45.03 mpg (Imp)
2.67 gal (US)/100 mi
898.65 Wh/mi
58 avg speed. 300km of my dad driving, he's getting better at it lol but he also did mostly highway. Not much ac use, a little bit colder, tried using the ignition key for EOC instead of the ign coil .kill switch. My theory was that the injectors were still pumping after the spark was cut. Will try the kill switch on the wires from the main steering column instead of the ign coil soon.

Total km represent my dad filling up and me filling up the top1/4 when he returned it.
2012-09-05 926 km
575.39 mi
60.79 L
16.06 gal (US)
13.37 gal (Imp)
541.22 kWh
$1.3
($79.03 total for this fill)
6.56 L/100 km
35.83 mpg (US)
43.04 mpg (Imp)
2.79 gal (US)/100 mi
940.61 Wh/mi
Lent the car to my dad for the first 1/4 tank,I was about 140 km off my usual 300km quarter tank mark, at that point tank avg wasd 8.4l/100. 3 weeks vacation so lots of short city trips, very little highway until the last 300 km. Avg speed was 45km/hr.
2012-08-11 976 km
606.46 mi
59.58 L
15.74 gal (US)
13.11 gal (Imp)
530.44 kWh
$1.31
($78.05 total for this fill)
6.1 L/100 km
38.53 mpg (US)
46.26 mpg (Imp)
2.6 gal (US)/100 mi
874.65 Wh/mi
Forgot to log it, can't remember details, avg speed was 57km/hr
2012-07-30 1070 km
664.87 mi
62.72 L
16.57 gal (US)
13.8 gal (Imp)
558.41 kWh
$1.26
($79.03 total for this fill)
5.86 L/100 km
40.12 mpg (US)
48.18 mpg (Imp)
2.49 gal (US)/100 mi
839.88 Wh/mi
58km/hr avg speed.
Vinyl wrap on the car, had the rear lip spoiler off for a bit and the avg display for the tank went from 5.9 to 6.1 over 200km. Display was 6.0 at end of tank.
Upper grill block came loose part way into this tank, only about 70% now.
2012-07-13 1015 km
630.69 mi
59.83 L
15.81 gal (US)
13.16 gal (Imp)
532.8 kWh
$1.27
($75.98 total for this fill)
5.89 L/100 km
39.89 mpg (US)
47.92 mpg (Imp)
2.51 gal (US)/100 mi
844.79 Wh/mi
1/2 the tank was 91 E0 gas, the other half was a mix of US E10 and Regular Esso Canadian gas.

I didn't notice any diff in the ign timing with the higher octane.

The usual EOC and P&G, this tank had some more days off work running around town, avg speed 56.

New 235 55 17 103xl installed, package is 51lbs vs stock 43lbs.

About 1/4 into the tank car was lowered approx. 1.2in.
2012-07-13 519 km
322.49 mi
34.8 L
9.19 gal (US)
7.65 gal (Imp)
309.7 kWh
$1.37
($47.68 total for this fill)
6.71 L/100 km
35.09 mpg (US)
42.16 mpg (Imp)
2.85 gal (US)/100 mi
960.34 Wh/mi
filled up 1/2 because we were having a heat wave, saw 70degree C intake air temp, noticed the ign was being retarded so I tried some 91 for a half tank, still on 16s most of the time but a short distance on my heavier but larger diameter 17s.

US E10 gas
2012-06-27 554 km
344.24 mi
30.49 L
8.05 gal (US)
6.71 gal (Imp)
271.29 kWh
$0.97
($29.58 total for this fill)
5.5 L/100 km
42.76 mpg (US)
51.3 mpg (Imp)
2.34 gal (US)/100 mi
788.08 Wh/mi
1/2 tank fill, trip to US, cheap gas (but E10, already notice the hit). Constant EOC P&G, varied speed range mostly 90-110 but had some good surprising success with 110-130 (was in a hurry). Next tank will be 17in larger dia tires.
2012-06-21 924.7 km
574.58 mi
60.163 L
15.89 gal (US)
13.23 gal (Imp)
535.49 kWh
$1.21
($72.8 total for this fill)
6.51 L/100 km
36.16 mpg (US)
43.43 mpg (Imp)
2.77 gal (US)/100 mi
931.97 Wh/mi
56km/hr avg speed
Start of tank highway trip 100km, no P&G
P&G hwy with EOC for most trips, very hot so some trips without EOC for AC use.
Best trip for the tank was 4.2l/100km, 48km.
Cars computer said 6.3.

US E10 gas
2012-06-10 482 km
299.5 mi
34.09 L
9.01 gal (US)
7.5 gal (Imp)
303.64 kWh
$1
($34.09 total for this fill)
7.07 L/100 km
33.24 mpg (US)
39.93 mpg (Imp)
3.01 gal (US)/100 mi
1013.82 Wh/mi
first 200km still breaking in the engine, then lots of EOC, hwy P&G w EOC, last 150km all highway w AC intake temps 60C+ timing was going back a bit, with the wife so no P&G, trip to the USA, so it was steady at 100km. Filled up at a half tank due to the 20% savings of US gas.
2012-05-30 671 km
416.94 mi
61.68 L
16.29 gal (US)
13.57 gal (Imp)
548.97 kWh
$1.23
($75.87 total for this fill)
9.19 L/100 km
25.59 mpg (US)
30.73 mpg (Imp)
3.91 gal (US)/100 mi
1316.66 Wh/mi
first tank, engine break in, constant shifting even at highway, minimal use of 6th gear even at highway speed, almost no hypermilling technique, 44psi tires, grill block installed half way through tank

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


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