When I take it easy and keep it below 70 I get 50. Ride hard I get 30-34.
I've tried 87 v 92.I lost 3mpg on 87.premium wins.Thats with stock tune.(Wag @ Apr. 11 2007,22:26) 1. Use 87 octane gas. Don't use 91 or you'll kill your gas mileage.
2. Change your plugs if it's been a while.
3. If it's been a while, check your tappet clearances and adjust if needed.
4. Also, synch your throttle bodies.
That usually works for me!
--Wag--