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After approx 600 miles, I averaged 10.5 mpg.
This was a pretty even mixture of city and highway. Timing is set at 12*. Truck does have a Flowmaster Big Block Muffler.
I installed a K & N filter today. I looked at the intake tubes and was going to do the mod, but didn't really see anything to fix. The connector piece looked like it would flow pretty good as is. Is there something I'm missing?
I will report mileage changes after the filter install.
There's something wrong with it, I just put a new O2 in my 5.0 F150 and got 16.2mpg on the last tank, but before that with the old O2 it still managed 13mpg.
last long trip with my now sold 94 f150 351 auto, i got 17.49 mpg. that was all 50-55 mph on the highway with a super light (less than 1000 lbs) popup camper in the back.
i just picked up a f350 460 5 speed and it got around 12mpg going from placerville to the bay area (read: all downhill).
Yea im not sure why mine is so consistant? I pulled a 6000 lb racecar last week and im pretty sure i got at least 10 mpg. Havent checked my mileage yet