315/70/17 Verses 285/70/17 BFG'S
 

Well the tires are the same price @ discount tire and I was wondering what one could expect ny going with the 315/70/17 I know there may be a little gas milage loss, but how much?

this would be the only thing that I have changes on with my 2006 4X4 2500 series Quad Cab

BF Goodrich All terrain TA KO

right now I am getting about 19 to 20 MPG and would very much like it to stay that way.

What do you guys think?

RE: 315/70/17 Verses 285/70/17 BFG'S
 

I would expect a 1.5 to 2 mpg drop. That's what i lost going from stock to 35's

RE: 315/70/17 Verses 285/70/17 BFG'S
 

I have 315/70/17 on my 06' Megacab. It added a nice 2" lift without doing a lift kit. Fuel mileage to go down a tab but I like the look

RE: 315/70/17 Verses 285/70/17 BFG'S
 

I lost from 1-2 mpg's when I went to 33"s (305/70/17) but the tread is a bit more aggresive than the BFG's and I think there a bit wider as well.

One thing to note is the BFG is a "D" rated tire. The load range is a little dif. and the side walls are a little thinner so you may get a little more bounce in the ride.

Great look though. Love mine. Easy trade for a loss in MPG's.

I dont know why DC doesnt go with a bigger tire / rim on these trucks to start. Looks funny. I mean look at the Fords. There comming with 18" wheels and they really fill up the tire well.

RE: 315/70/17 Verses 285/70/17 BFG'S
 

Many thanks I have noticed about a gallon or two drop not much considering...

RE: 315/70/17 Verses 285/70/17 BFG'S
 

I just saw a new 07 3500 CTD with duels at the local stealer that had 235/80/17 [sm=badidea.gif] yet my 06 2500 has 285/70/17 and so did another 07 2500 sitting next to it[sm=dontgetit.gif]

RE: 315/70/17 Verses 285/70/17 BFG'S
 

Wouldn't mileage increase by replacing 285/70/17 tires with 305/70/17?

RE: 315/70/17 Verses 285/70/17 BFG'S
 

no, your spinning a heavier tire at a lower tpms. plus it's wider and will present a wider surface area to wind resistance. the added height of the tire will lift the front end slightly increasing the wind drag... more of the axle is esposed... 4x4.

RE: 315/70/17 Verses 285/70/17 BFG'S
 

My mileage change was negligible going to 35's - but then I think the factors Steve0 outlines have a greater effect when you have the 3:73 rear versus the 4:10 - seems like my 4:10 mileage was not-so-great to begin with, and the larger tires couldn't make it worse. But one of the many things I've learned from this forum is what a difference in driving technique can make in the mileage - and not following the logic of gassers where if you take it easier you get better mileage. Like the guys here have claimed, when I push it my mileage actually gets better to the tune of almost one MPG. (but so many years of driving like a granny after racking up too many tickets makes it hard to get used to pushing it)

RE: 315/70/17 Verses 285/70/17 BFG'S
 

How are you driving it differently than a gasser? I don't quite get what you're saying.[sm=dontgetit.gif]
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