Originally Posted by Stygshore
My tank is 26 gallons so maybe 7.5 mpg is the best the 5.4 can do towing. Previous owner had it all decked out for towing when I bought it - maybe that's why he got rid of it - just couldn't do better no matter what he threw at it
His tank is 26 gallons. He towed 90 miles and drove around for 50 and used 1/4 tank (6.5 gallons). Estimate he got about 18 mpg just driving around in an F 150 for 50 miles, that would of eaten up about 2.7 gallons leaving 3.8 gallons for the 90 miles pulling the trailer, or 23mpg towing.
Check my math..................where do I get one of those tuners?