not sure what I get city but the last time I checked I got 33mpg highway (not all highway, some was stop and go) speed limits ranged from 35 to 65.
the only improvement I see when I run premium is my car doesn't ping going up hills when under a heavy load (2nd 5-6k) if I run premium I don't have the pinging. I don't have increased throttle responce or any more power, just the pinging goes away.
