has anybody intentionally tuned their car to run lean all the time for max mpg??

 

You know, I've wondered almost the same, but Idk if it's been done.

 

You'd have to tune for a proper a/f ratio, but you'd have to lean out air and fuel and change compression to do that.

It could be done. You'd have less power.

 

honda did, lean burn on the vtec-e engines, you won't get any better than that.

IIRC the p07 leans the engine out up to 17:1afr

But I don't really recommend playing with this unless you REALLY know what you're doing.

If you want better gas mileage I'd recommend doing a warm air intake to fool the IAT to lean your afr for you. Then work on decreasing drag and increasing aerodynamics. This are a hell of a lot simpler and effective than hacking the fuel and ignition maps.

 

You want the best gas mileage, stay at stoch (14.7)

 

I would think modifying your driving style could have a much more significant effect on your mileage.