Good morning gents - the coyote in the F has thrown this code P0172 (air fuel related - Lean) the truck is around 95,000 change air filter 5k ago change oil regularly with synthetic - truck seems to run fine but I thought I may be hearing a slight ping at low rpm accelerating - fuel mileage seems ok - was wondering if I should bump up to high test....any thoughts? - I cleared the code and will see what happens but the truck runs fine....?