milage sucks

[cumminonu]

i used to get around 18 mpg then i put an afe intake with tourque tube and 285 nittos and now i get about 15.6 do the tires make that much of a difference in my milage? i run 50 psi in the front and 45 in the back..i rarely get on it to much anymore just normal driving

 

[IKNOWEVERYTHING]

if you put larger tires on did you correct for tire size? If your speedo is off then your odometer is off , that could be part of the problem and then yes bigger tires or tires with aggresive tread can affect mileage.


IKE

 

[bsmith]

i would up the air psi to the max or 5psi under. that will help a lil.

 

[cumminonu]

yea the tires are a bit larger i guess i one mile on my odometer is farther than an actual mile im going to clock it beside my dads truck and see what the difference is

 

[Whippit96]

if your stock tire size is 245/75/R16 and you put on 285/75/R16's then your speedo is off by 7.8%. So if you have 400 miles on your trip meter you times it by 7.8% and that is that actual mileage driven. Then just do you gallons/mileage equation to get your mpg.

 

[cumminonu]

ok that sounds alot better it comes out to 19! way better than 15.6....thanks