Blakemcclainjm
Registered User
When I was younger my dad had a 91 f150 2wd 351m automatic with dual tanks starting mileage was 12 mpg. Mileage was checked by putting 2 gallons in an empty tank and driving down the same stretch of road each time. After cutting the cats and adding duals mpg increased to 15, then a tornado intake fan was added and the mileage increased to 17. I've heard lots of people say that the tornado did absolutely nothing for them, but have any of you ever tried this on the 6.9 or will it even fit on the 6.9?