bluetahoe
Newbie
On my old TBI G20 Ethanol free 91+ octane was worth a good MPG gain as long as the timing is advanced 6-8° from stock spec. The engine made alot more torque.
That's a good point. HIgher octane with ethanol vs regular non ethanol. And being able to advance the timing.
I've not done the 411 swap to make the programming easier and so haven't tried to play with timing.
I'm kind of waiting until I get more miles on it then do an LS and tranny swap.
But, I'm pretty happy with the MPG I'm getting on the highway. BTW, I get about 12 to 14 in town.