Zero Cost manual MPG meaurement (xpg)

[three6t]

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

[nemo]

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.

[bestclimb]

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.

[P-hack]

diy instrumentation, accurate to within %1, is like $20 in parts on a bad day.

[RobertISaar]

...... 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.

[gumby79]

Originally Posted by P-hack

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

[elhigh]

Originally Posted by P-hack

diy instrumentation, accurate to within %1, is like $20 in parts on a bad day.

Well...

On EFI cars, sure.

[gumby79]

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

[user removed]

If you know:

Fuel pressure
Injector cycle duration
Distance traveled

You should be able to calculate fuel consumption.

regards
mech