Quote:
Originally Posted by ihaveacamaro
Where I live it's 40 cents more per gallon  |
Ours is generally 30 cents more, but the Exxons here put it on sale every Tuesday 20 cents off; then it's lower than 91 and about 6 cents above regular.
Anyhoo, I'd say if the engine is audibly knocking on recommended grade gas, have a mechanic look at it or see if there's an ECM update (had one on our '10 Equinox, made a huge difference). In any case, no one engine is the same as another, ambient conditions/fuel quality matter, YMMV, etc etc...