[rocketfast321]

Now really, they can get lazy over time. This was mine at 109k in my old grand am.


I kelp a heavy foot so my mpg was crap. But still not better in my alero my alero. Maybe its in my head but i try to run 89 gas at times or ethanol free gas to help mpg.

I also use Lucas fuel treatment. But this post from bob the oil guy fits me.

Any time I ever used it it seemed to help mileage however it never lasted. 1 or 2 tanks were better then mileage would slowly return to normal.
It almost makes the consider that the engines ecu calibrates mileage. Once it gets too good the ecu does something to make the fuel consumption come back to programmed parameters.
I've found if I alternate different products and keep the ecu guessing I can routinely beat the advertised averages.
Tin foil hat on