Would like some expert advice..lol (LS2 & gas type)

the computer will reduce the timing until the knock semsors are pleased, BUT that will throw all your fuel mileage and perfromance out the window, so its cheaper in the end to run better gas

If i put 87 in my Z28 (LS1) i get spark knock like all get out. It seems to be fine if you putter around, but other than that, the noises wil make you think otherwise

that ls2 has some decent compression, so its not really good to run a lower grade fuel.

Yeah it should get better milage on the better fuel. Our tuner can squeak even more power and milage out of one by messing around with the target AF ratio at lighter throttle settings. Pretty neat stuff to dig into the programming that deep.

my truck with a 5.3 behaves the same way, running 87 mileage is not so great with 93 it pulls the trailer like a completely differant truck.

weird, on the carbed Ls1's they like 87 better

i don't know .....my 5.3 runs great on 87, i will have to try a tank of 93 to see if i feel a difference.

All I can say is reduce E85 by 30% of regular gas prices and I'm sold.