I had a 92 F150 with the Mazda tranny and the 300 six. Best mileage I ever saw was 20 on a pure highway trip at 65-70 MPH. My solution was to get a 97 Ranger 2.3 5 speed and a 3.45 rear end. Best tank so far in the Ranger was over 33 MPG. For some reason the old 300 inline just is not that good on mileage and I have heard the carbed ones could do better, but I think the 5.0 has better heat distribution and may actually be the better choice. My solution was to drive my 150 very little, later I sold it.
regards
Mech
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