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Old 01-25-2014, 06:15 AM   #1 (permalink)
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Zero Cost manual MPG meaurement (xpg)

RPM Reading / Vehicle Speed

Minimizing RPM and Maximizing Speed is the GOAL

Here are some examples

divide rpm /1000 , 1000=>1, 2000=>2 3000=>3

divide speed by above figure

eg
30 /2 = 15 xpg (@2krpm)
60 /3 = 20 xpg
140 /4 = 35 xpg (@4k rpm)

Now with experience try to figure out xpg to mpg ratio by comparing it with actual mpg, and you can just readout your mpg without requiring any instrumentation

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Old 01-25-2014, 06:46 AM   #2 (permalink)
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You method may get you in the ballpark on a level nonstop drive after much trial and error. Many people look at the gas gauge and say it looks like I'm doing better. This to is not very reliable. There are far too many variables wind, traffic, hills, temperature, etc. With real time feedback from an MPG gauge you get to see how every touch of the pedal, hill and condition change affect MPGs.
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Old 01-25-2014, 01:24 PM   #3 (permalink)
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Far too much depends on load and throttle position you can be making 5mpg to 999999mpg in the same gear at the same speed without seeing "fuel/time" you will never know. This may put you close in some conditions but could lead you to making an incorrect assumption more often than not. It also does not give you a cumulative average, which can be as or more important than instantaneous for figuring out how you are doing. If you want real feedback you need some sort of instrumentation.
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Old 01-25-2014, 02:21 PM   #4 (permalink)
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diy instrumentation, accurate to within %1, is like $20 in parts on a bad day.
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Old 01-25-2014, 06:19 PM   #5 (permalink)
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...... so you're calculating your vehicle's gear ratios?

because that is what that equation will work out to.

every gear will have a different value and once in a gear, the value should remain the same, minus any clutch or torque converter slip.
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Old 02-28-2016, 11:57 AM   #6 (permalink)
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little jona - '91 Dodge D 250 first gen cummins LE
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Quote:
Originally Posted by P-hack View Post
diy instrumentation, accurate to within %1, is like $20 in parts on a bad day.
Point the way sencers are minimal VSS, TPS, TRANS TEMP, IAT , COOLENT TEMP, . TCM ONLY aftermarket add EGT,MAP ,

HOW to geno scain gadge andreno. Some thing more accrueit. better than pin and paper. 1% @$20 sounds good
what is needed. Some kind of fule flow rate meeter. Rpm sincer port. Tap into the VSS and some programing skills I Do NOT have
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ehxsost manafulld wrap, Aero Tonto
best tank: distance 649gps mi 24.04 mpg 27.011usg
Best mpg : 31.32mpg 100mi 3.193 USG 5/2/20


Former
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'79 Chevy K20 4X4 350ci 400hp msd custom th400 /np205. 7.5-new 14mpg modded befor modding was a thing
87' Hyundai Excel
83 ranger w/87 2.9 L FI2wd auto 18mpg on the floor
04 Mitsubishi Gallant 2.4L auto 26mpg
06 Subaru Forrester XT(WRX PACKAGE) MT AWD Turbocharged 18 plying dirty best of 26mpg@70mph
95Chevy Blazer 4x4 auto 14-18mpg
04 Chevy Blazer 4x4 auto 16-22mpg



Last edited by gumby79; 02-28-2016 at 12:11 PM.. Reason: Fix incomplete
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Old 02-28-2016, 07:50 PM   #7 (permalink)
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Quote:
Originally Posted by P-hack View Post
diy instrumentation, accurate to within %1, is like $20 in parts on a bad day.
Well...

On EFI cars, sure.
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Old 02-28-2016, 10:49 PM   #8 (permalink)
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little jona - '91 Dodge D 250 first gen cummins LE
Team Streamliner
90 day: 23.4 mpg (US)

Little Jona airo modded - '91 Dodge RAM 3/4 TON D 250 2×4 AUTO
Pickups
Team Cummins
90 day: 18.5 mpg (US)

The Salted Hound Jenny. - '87 Dodge Ram 50/D-50 5sp 4X4
90 day: 20.24 mpg (US)

Jona Allison aero - '91 Dodge Ram D-250 Le
90 day: 20.76 mpg (US)
Thanks: 208
Thanked 426 Times in 277 Posts
AutoSpeed - Real World Fuel Savers some things I found in my search for knowledge on eco modding this will help those with OBD 1 and OBD2 rigs. This site has lots of tech articles on modding for .... Mpg
hp
aerodynamic design/performance/and principles how to test airo.
And hours of studying. With proof of concept explained
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1st gen cummins 91.5 dodge d250 ,HX35W/12/6 QSV
ehxsost manafulld wrap, Aero Tonto
best tank: distance 649gps mi 24.04 mpg 27.011usg
Best mpg : 31.32mpg 100mi 3.193 USG 5/2/20


Former
'83 GMC S-15 Jimmy 2door 2wd O/D auto 3.73R&P
'79 Chevy K20 4X4 350ci 400hp msd custom th400 /np205. 7.5-new 14mpg modded befor modding was a thing
87' Hyundai Excel
83 ranger w/87 2.9 L FI2wd auto 18mpg on the floor
04 Mitsubishi Gallant 2.4L auto 26mpg
06 Subaru Forrester XT(WRX PACKAGE) MT AWD Turbocharged 18 plying dirty best of 26mpg@70mph
95Chevy Blazer 4x4 auto 14-18mpg
04 Chevy Blazer 4x4 auto 16-22mpg


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Old 02-29-2016, 08:55 AM   #9 (permalink)
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If you know:

Fuel pressure
Injector cycle duration
Distance traveled

You should be able to calculate fuel consumption.

regards
mech

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