tire options
#1
tire options
Hello Everyone I have a 1986 f250 with a 6.9 with a four speed cruising around town isnt bad but highway cruising kills fuel mileage I have stock tires 235/85/16's on there does anyone know if I switch to a 285/75/16 will this help with highway driving or really wont make a difference. any suggestions would be appreciated I was thinking about putting in a 5sp or a automatic but dont have the time to get involved with that
#2
#4
Highway travel isn't really efficient for these trucks at all. They get there best mpg when kept under 2k rpm. Changing gears is the easiest way to change that. With the right combination of gear/tire, some guys can cruise at 70mph at 1500rpm. My 86(with a 4spd) has 3:55 gears and 235/85 tires and I hit 2k rpm at 55mph.
#5
How do you figure out what gears you have? And how do you change the ratio? Just a new rear end or what? Cause I have a 93 7.3 and it runs around 2500 at 70. And goin to Monroe from my town on the interstate I'll use 3/4 of a tank there and back and it's around 65 miles round trip. Terrible gas mileage. So I stay off the interstate and out of Monroe.
#8
#9