I have a 5L F150 V8 2 wheel drive, I am one of those people that believe in V8's. I have a breather kit and duels. Power, unreal, coming back from up North, and limited to 90k max, got 26.5 MPG, US. went down South and was limited to 115k and got 25.5 MPG, US. Around town every time stand on it you watch the gas gauage go down. I am lucky to get 12 MPG, oh well. Needless to say I travel a lot. Don't know if this helps a lot but it is my experince.
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