[loufish]

I see what you are saying and that makes sense, I was thinking the same. Didn't know if it would be a huge difference or not. When I hit the track I have 1/4 tank or less, remove spare, remove rear seats remove any unnecessary junk in the cab and lower the rear tire pressure to help with the weight reduction and still only muster a 15.5

Sounds like you're throw'n down most of the tricks!
Don't for get to air up the frt tires...