My mileage is only 2 MPG different with Vinces tune

 

I don't daily drive the Cobalt anymore anyway... the extra power and the fact its cheaper has me sold on E85

 

I have a 09 SS/TC can I run this in that car? Can you run regular if need after running E85?

 

you have to tune for E85... then you have to run E85... you can have a "93 tune" and an "E85 tune" and switch back and forth, but I wouldn't recommend that... if you can't run E85 full time, I wouldn't tune for it, IMO

that is why I have waited on E85... I waited until I got another car to drive back and forth to work... we have E85 stations but not near enough for me to "rely" on it for fueling... as is now, the Cobalt is my weekend/casual driver... so its not a problem to run E85 with only a few E85 stations here, I have a work car for my commute to work

 

thank you makes sense

 

I don't understand what the problem may be by switching on a pinch to an empty tank. I've never tried it, but I assume all that needs to be done is resetting fuel trims? I'd like an explanation on why it is bad though.

 

yea its not good at all.
there was a little bit of 93 in the gas lines in the car i tuned even though we ran it empty. the car went into reduce engine limp mode.
once the 93 was all gone the power finally hit, and we were good to go.

 

it's closer to 30% or more as far as engine requirements which equates to an equal reduction in MPG's... you save a dollar at the pump but in the end the cost of running each fuel is so close, there's very little to no savings. just FYI