MPG loss?

[02SE]

Well if we are getting technical, you should through weight differences of larger/smaller tires as well as rotating mass and sprung/unsprung weight in the mix

So many variables with tires.

Yes, there are many more variables that I didn't mention. I don't/didn't have time to type out an essay on tires, though.

I also didn't mention inflation pressure, different tire construction methods, rubber compounds, number of belts, the type of belts, the material used in the construction of the belts, etc., etc., etc.

The point was and is that yes, tires can affect MPG.

 

[JayRolla]

You know what mostly affects gas mileage?

YOUR FOOT!!!!

 

[D Farms]

the guy at my coffee shop had some good year mtrs on his jeep and said it was getting about 13 mpg and switched to some at3s and is now getting 17 mpg.

originally my truck came with 225/75r15s and my dad doesnt remember the mileage. on the other hand for the last 160k miles my truck had michelin quiet highway tires and was getting about 16 mpg, 17 before the lift and other modifications. now with 315/75r16 bfg ko2s im getting 15 all the time. i have the 5vz and 3.90 gear ratio. mileage is also highly dependant on driving style. with the bigger tires you just need to accelerate slower than before.

 

[gamefreakgc]

I also know that most people don't really track their MPG's and will make claims larger than what they really are. They might track once in the winter before the "change" and once later in the summer after the "change" and not take into affect they might warm up their car before hand, summer/winter fuel blends, temperature changes, etc.

My best MPG fill-up was after driving to Nevada through a snowstorm over the pass. Go figure.

 

[azcat90]

Jesus dude, I know they got small tanks but below 200 is ridiculous.

Based on the tire size difference you're really getting around 214 miles per tank. That is about what I get with stock size tires and it usually works out to about 14-15 mpg for me. I could get a lot better if my foot wasn't so heavy on I-79 - with my 2000 I once got 17.5 on a tank by never going above 63 - my commute is 75% interstate.

 

[IrmoRabbidMoose]

Yes, lesson learned. I wanted a more aggressive look and was willing to make a sacrifice in efficiency but I didn't know it was going to be this drastic. I mean 3-4 MPG difference is kinda significant. Also might help to know that the tire shop that put em on did a horrendous job with the balancing. Had to take the truck back 3 times and it still shakes like hell at 65+ that's another factor as well. What else do you guys do to increase your MPG that's wallet friendly?

 

[SpidermanGeek]

Trade the rig in for a Prius?

 

[SLO_Rob]

How many gallons are you putting in? You know about the fuel gauges being notoriously innacurate right? Our tanks hold 18.5 gallons if my memory is any good.

I can get over 300 miles a tank with stock sized tires but my fuel gauge is off. When it drops down to the "E" with the light on I still have 5 gallons left.

Odd, I just checked that today. I hit E and then capped it off, putting in 15 gallons too.