MPG log

[Jrgunn5150]

Hi, I'm new to tuning, but I've dove in fully.

I've found the older formula by Soundengineer for logging MPG, I tried copy/pasting it directly in and it isn't functioning on my V3.6, but it's a very old formula and may not be fully accurate any longer.

Does anyone have anything more recent that can show instant and average MPG? It's on a PO1 processor on my 8.1 truck.

[dmaxs10]

In for info. I also tried it and couldn't get it to work

[Jrgunn5150]

I found this also now that I'm home, I'm working on it now.

Here you go.

Go into VCM Scanner... Tools menu... Math Parameters... then go into the user defined section.

In the first unused entry:
Name: MPG.

Abreviation: MPG.

Notes: Instantaneous MPG

Expression: (200-6*[82.155])*[50020.114]/[6210.72]/[50151.248.avg(700)]/[50070.56]
You can paste it.

Unit: One

Decimals: 0

In case anything isn't detected:

200 is the constant used to convert units. Change to 400 for V8 and 300 for V6. You can also adjust this value up or down to calibrate the gauge.

[82] = Ethanol Fuel % (SAE)
[50020] = Vehicle Speed [Sensor] (mph)
[6210] = Injector Flow Rate (lb/h)
[50151] = Injector Pulse Width - Bank 1[Sensor] (s)
[50070] = Engine Speed (rpm)

If you don't have an ethanol sensor (most of you won't), replace [82.155] with 10 for E10 or 85 for E85 or whatever you fuel with.

Now you can plug MPG into a Gauge or Graph or Chart.

MPG in a Ellipse Gauge to match your RPM and Speed is neat.
MPG in a graph with RPM across the top and Vehicle Speed on the left (in 5 mph increments) is useful. You could also do Cylinder Airmass on the left to match your Timing graphs. I have both.
MPG in a Chart also works.

Enjoy!

[Firebirdmuscle]

Thanks for posting that up. I had the old one back on the 2.24 version and havent gotten it to the new 3.xx setup yet. Im going to try this out this weekend.

[Obsolete489]

MPG.MathParameter.xmlMPG.PNG

I'm not sure if all the PID numbers will work so I took a screenshot of the sensors you need. Give this a try.

[[email protected]]

MPG.MathParameter.xmlMPG.PNG

I'm not sure if all the PID numbers will work so I took a screenshot of the sensors you need. Give this a try.

hey man i put that into the truck i took off the e10 or e85 ,and i changed the 200 to 400 for a v8 and im getting like 40mpg and i know thats not right then if i move it back to like 200 then i get like 20 which is still not right as i get like 170miles to the tank on a good day and i believe its a 25gal tank is there something im missing ?

[Obsolete489]

hey man i put that into the truck i took off the e10 or e85 ,and i changed the 200 to 400 for a v8 and im getting like 40mpg and i know thats not right then if i move it back to like 200 then i get like 20 which is still not right as i get like 170miles to the tank on a good day and i believe its a 25gal tank is there something im missing ?

Can you take a screenshot of your math expression so I can compare?