Just throwing this out here...

Does anybody know how our JKs calculates MPG? Any by "our", I mean "your", as mine doesn't have the in-dash display.

I am following a trail that looks like it leads to the on-board computer using the IAT sensor and some other sensors, and runs that through some math.... and out pops an MPG estimate.

Anyone every fiddled with their OBD port? Any clues what crazy science goes into this equation?

 

Heading to NAPA and Sears maybe some racheting wrenches

 

For reference, I found this quote out on the net:

 

I am not good with wiring but somewhere in a thread a guy had the entire wiring schematic

 

And a 33mm socket

 

Here is an interesting read, I've just scratched the surface

omninerd.com/articles/Improve_MPG_The_Factors_Affecting_Fuel_Efficiency

 

Humm... let me run some numbers here, tell me what you guys think...

2289 RPM x (57.0 kPa / 50.0 F') ---- Here I am assuming "Absolute temp" means the Intake Air Tempurate"

Engine Mass Airflow = 2289 RPM x 1.14 kPa/F' = 2609.46 RPMx(kPa/F') --- WTF is this unit

Fuel Mass = 2609.46 / 14.7 = 177.514 --- I gave up on units bob

So here I am with a fuel mass of 177.514, but I am not sure what a fuel mass is or how to go from here to MPG... still reading

 

New shoes are on.....

 

Lookin' good

 

Very nice. Great Success (in my best borat voice)