ohbutyo
Junior Member
I run 87 most of the time as cant tell any power difference to the #1 when i do use it. Maybe it shows up a bit at the strip, but not on my buttmeter . Mileage? no idea as I hate to check it at the best of times. I would expect it will advance the timing a hair with it and improve it a bit as all my other cars that required #1 did.. Don't worry bout knocks or rough running, knock sensors and computers fixed that, has for 20 years, and if it hasn't, then theres a problem with your truck.