Fuel Mileage

[fordF250]

I am running 245/75/16's on my truck. My friend keeps telling me if I go up to 285's I will get better mpg. I have 4:10 rearend gears. The biggest I want to go is 265's but if I am going to get better mpgs then Ill get the 285's. right now im probably getting 16mpg mixed highway and city.

[Fordman247365]

Wow them are small tires you got on there. I would go to at least the stock size 235/85 16

[fordF250]

the 2nd number is the height?

[Fordman247365]

I have no idea what is up with the 235/85 16, they are like 32.8" tall (dont confuse with a 235/75)

[Fordman247365]

I was wrong....
31.7 tall, 9.3" wide

The stock 235/85 16 will be over an inch taller than your 245's

I would put 285's on it, but thats me haha

[fordF250]

285's are 32.x inches and 255. are 33.x. maybe ill go 255

[Fordman247365]

Yup the 255 is just a touch narrower than the 285

[jdffafarmer]

the first number is the width in mm the second number is the percentage of the width that one side of the sidewall is tall...so to figure the height you take your 235*.75*2+rim diameter and that should give you your height

[STROKED_NY_023]

I am running 37" tires with 3.55 gears an am getting around 20 on the highway...

[jdffafarmer]

wow, 20 on 37s sounds pretty good, i can get close to that on my 265/75/16s and 3.55...got another set of rims i would like to put 285/75s on