I know there is information scattered about, but I would like to get an idea of what kind of mpg's you guys are getting when going to different tire sizes.

I got 285/75/16 on stck rims I get about 21-22mpg and with my 305/70/17 also about 21mpg on the interstate not loaded.

What u got done to your truck? Add to your profile

i have 35s i average about 17-18 depending on my right foot.

With 315's I am about 18 highway and 14 city

sheez the last 3 months my truck has been acting like its a psd getting 11 to 14 city and hwy the 14 was 95% hwybefore that it was 20 on 35s

You problem is probably not related to mine but in NE Ohio we see fuel economy drop in late October/ early November due to the addition of winter additives into diesel we have 34 trucks ranging from duramaxes, power strokes, Detroits and many larger Cummins every truck loses MPG but the Duramaxes and power strokes usually drop 3-4MPG in the city

In 50k i saw 20 mpg avg with 245's
In 39k i saw 22 mpg avg with 285's
In 36k i saw 20 mpg avg with 295's
Current tires are 60% worn thinking about doing 255/85/16 next time

When i did the 285's i also did the edge and the straight pipe

Thanks for the info coming in. I am looking for about an 02 LB7 4x4 and like everyone else cannot stand the 245 tires they come with.

Well with mine i have 37s. I did a hand calc and it came to 23mpg. I filled it up and did a 70 mile trip and burned alilltle over 3 gallons

Well with mine i have 37s. I did a hand calc and it came to 23mpg. I filled it up and did a 70 mile trip and burned alilltle over 3 gallons

Is that with the correction for the bigger tires?

with my 315/75/16 i get about 17.5 with warm weather. Winter its usually about 15.5. Best ive ever had in the truck was 22mpg coming back from chicago, but i drafted a lot on the way back.

I get 20 - 21 MPG all day long going 70 MPH w/ 305-70R-16 on stock rims. For my last 58,000 miles my average says 22 MPG w/mixed city 60% and highway 40% driving. 60% of the highway driving is in stop and go traffic. So don't worry, tires won't kill your mileage, it's your right foot. I set the cruise once at 55 MPH on one trip, and got an average of 29.8 MPG for 300 miles, man was that hard though. Your mileage is based on your driving habits, its that simple.

I get 20 - 21 MPG all day long going 70 MPH w/ 305-70R-16 on stock rims. For my last 58,000 miles my average says 22 MPG w/mixed city 60% and highway 40% driving. 60% of the highway driving is in stop and go traffic. So don't worry, tires won't kill your mileage, it's your right foot. I set the cruise once at 55 MPH on one trip, and got an average of 29.8 MPG for 300 miles, man was that hard though. Your mileage is based on your driving habits, its that simple.


when i was working up north it was hard to drive over 55. I thought everyone just drives slow up there. down in st. louis if your not going 80 you better get on the shoulder. :D

calirider and cajun86,

do you guys run tuners on your truck?

when i was working up north it was hard to drive over 55. I thought everyone just drives slow up there. down in st. louis if your not going 80 you better get on the shoulder. :D

Like I said, it was hard to go that slow. Just did it to see the mileage numbers. Not too many people drive slow in the auto capital of the world, the highway's are race tracks around here.

Like I said, it was hard to go that slow. Just did it to see the mileage numbers. Not too many people drive slow in the auto capital of the world, the highway's are race tracks around here.

i was around minneapolis for a few months. might be because they are green everything around there. I had trouble figuring out what bins to put my separate pieces of trash in.

Is that with the correction for the bigger tires?
No i dont have the correction. yet. I was going 60-68 mph

i was around minneapolis for a few months. might be because they are green everything around there. I had trouble figuring out what bins to put my separate pieces of trash in.

We all know that Detroit is far from being green.:D

My best was 24 mpg with 35's on. but i usually average 20 to 22 mpg.

calirider,

do you guys run tuners on your truck?
No, Why?

Well, not only does it depend on tire size it depends on the tire and how aggressive it is. Like a BFG mud compared to a more agressive Swamper like SSR, the SSR will yeild worse MPG in the same size. I have 305 SSRs with mods and 50/50 i get 14mpg.

Are you guys kidding me? The best i have ever seen is 18 mpg with my truck. 285 BFG AT. Fuel filter is always changed. I'll be taking a 2000 mile round trip to Galveston Texas in bout a week, i'll get a good estimate then

Are you guys kidding me? The best i have ever seen is 18 mpg with my truck. 285 BFG AT. Fuel filter is always changed. I'll be taking a 2000 mile round trip to Galveston Texas in bout a week, i'll get a good estimate then

You going for Spring Break? haha. Because if you are, Galveston isnt the place to go...

Ha umm ya we kinda are. The main reason is cause our friend has a house there. What do ya think the damages are?

I have 285's and average between 16.5-17 with mostly city driving. The best I got was 21 on a summer trip.

With my 315's going 70mph down the highway sitting right at 8,000 lbs on the scale I can get 25mpg if I don't get on it too much.

I wish I could get that kind of mileage. This winter I have been running 265/75/16 nitto terra grapplers on stock rims to save my 20's. I always use power service and even with a fresh filter the very best I could muster was 15 mpg. highway, hand calculated, and I was really trying too. On average I get 13.5 mpg. or so. Maybe Its b/c of my truck being higher, with the greater wind resistance and the winter fuel blend.

I get about 16 mpg on average (mix of highway and city) with 285's on winter fuel. Summer I get 17 to 18 if I'm trying on the 285's.

Just filled yesterday. 18.8 on that tank. We had a week with the temps up around 40F and that really helps (it was COLD before and that kills mpgs)

Truck since new has gotten an overall average of 17.716 mpg with a fair amount of towing, but mostly running empty and mostly running out of town. Vehicle mph overall average is 40.2.

I run 285/75/16's and it all depends on the speed. At 65 it gets 20-22 at 75 it gets 18-19 at 85 its drops to 16 or so. some of the responses seem awfully high at 25. I can't get that even if I drive 55 on a dead flat road with no wind.

I have the juice with attitude.

Ha umm ya we kinda are. The main reason is cause our friend has a house there. What do ya think the damages are?

Dunno about damages, but if your talking about having fun go to Port Aransas or South padre.

[quote=SteveCA;3187194]I run 285/75/16's and it all depends on the speed. At 65 it gets 20-22 at 75 it gets 18-19 at 85 its drops to 16 or so. some of the responses seem awfully high at 25. I can't get that even if I drive 55 on a dead flat road with no wind.

I get the same with 285's on my LBZ's. Not sure what duramaxxen was hand calculating if he didn't account for the tires? They are about 20% off which at 23mpg would make it over 27mpg:cool: People have to take everything on forums with the knowledge that 50% of what is said is 100% BS;)

Not to mention most use the DIC and dont hand calculate. With the edge and tires my DIC allways reads 2-4 mpg high versus hand calculating and correcting for tire size.

LOL! I have 37's on mine and daily driving I get 14.5. I might get 17 on a raod trip. The speedo is recaled with superchips maxed out at 35's

I have 285's and i get 18mpg on a good day with a tail wind.

I did manage 24MPG on occasion but it was on a 70 mile stretch of road from Tahoe (6200 feet elevation) to Roseville (Sea Level). As soon as I stopped going down hill, the regular MPG numbers applied.

I get 19-20 on the stock 245. I might get higher if i could find a flat road for more then a mile or 2. Always seem to have to go up hill.

how do you calculate for larger tires??? is there a formula??

I get 20 on the highway empty at 65 on 265s - lost about 1-2 MPG when I moved up from the stcok 245s.

how do you calculate for larger tires??? is there a formula??


New tire height divided by old tire height. Take that and multiply it with the miles traveled. That gives you the actual distance traveled.

The 245/75/16's are 30.5" tall.


For my truck with 255/85-16 M55's which are 33.3 inches tall, it looks like this. Let's say I go 400 miles on the odometer and fill up with 20.0 gal of diesel.

33.3 / 30.5 = 1.0918.

1.0918 * 400 = 436.7 miles

So the uncorrected mpg would be 400/20 or 20 mpg. The Corrected mpg would be 436.7 miles / 20 gallons or 21.8 mpg.

Box stock truck on the 245s I set the cruise control on 75 in Evanston WY and ran to Las Vegas and got 26.8mpg
Over the course of the whole trip, down, back, running around out in the desert and in town, 25.6 mpg.

When I had the 265s on it seemed like the best I could get was 23mpg.

Moved to Wheels and Tires

Getting ready for my 4th set of tires. Have 55k on the truck right now. First set was the stock 245s. For the first 30k I kept a religious log of my fuel consumption, but stopped somewhere along the way as it was too depressing. heh. :p:

245s - stock -mixed average was around 17mpg
265s - Wildcat TXR - mixed average of about 15.5mpg
265s - BFG AT KO - mixed average of about 15mpg

Now, I have got as high as 18 on the 265s, but only on long trips. I always hand calculate, though the DIC is pretty close (my last tank averaged 15.16 mpg, and the DIC reported 14.5).

Truck is bone stock performance and height wise (other than a few cranks of the t-bars).

I'm getting 13-14 in the city and 18-22 on the interstate. Interstate mileage varies a a lot depending on how fast you are going. All of these #'s are with 35's and 8" lift.

My best ever was 17 on the highway. I get about 13-14 in town. I can't seem to do any better than that.

Well, I should probably mention that the numbers I listed above are mixed, but probably 80% freeway driving. If I were to go off total short trip driving, I am much closer to 12-13mpg.