11-04-2005, 11:43 PM
You won't be able to get a tune that will improve on the cruise fuel economy of the stock car. You might be able to get better economy while full throttle, if you trim the fuel enrichment and retard spark. But for cruise, if you have a cat you have to run 14.7:1 AFR, and the EGR settings are probably optimized already... so it is what it is.
I managed to improve the economy of my car with a lean burn cruise, but I can get away with that because I don't have a cat.
I managed to improve the economy of my car with a lean burn cruise, but I can get away with that because I don't have a cat.