MPG Hit With Wider Tires - Ford Mustang Forum
 
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post #1 of 13 (permalink) Old 09-14-2013 Thread Starter
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MPG Hit With Wider Tires

For those of you who have upgraded to wider tires on your V6, how much of a mile per gallon hit did you take?

Originally I had 225-wide Goodyear Radial T/A (all season) tires and now use 255-wide Bridgestone Potenza (all-season) tires. The offset of the new rims also seems to push the tires out into the slipstream a bit too. I went from a typical commuting average of 27 down to 24 at best. I've played around with tire pressures a bit, and haven't noticed a change.

My commute is pretty short, but I'm just wondering what other peoples experiences are in case this isn't normal.

Love the new look though!



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post #2 of 13 (permalink) Old 09-14-2013
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Wheel weight plays a role in that too, especially around town.


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post #3 of 13 (permalink) Old 09-14-2013
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What does the new combo weigh per corner? City driving and more weight will definitely be noticed.

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post #4 of 13 (permalink) Old 09-14-2013
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None. My 18x10's are about the same weight as my stock 17's. It's all about the weight.

https://docs.google.com/spreadsheet/...Wc&usp=sharing

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post #5 of 13 (permalink) Old 09-14-2013
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It actually depends on the tires. When I had NT05s I have a mpg hit of around 2 or 3.

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post #6 of 13 (permalink) Old 09-14-2013 Thread Starter
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I only casually looked at the weights when ordering my wheels and tires. They looked close so I didn't give it much thought. On closer look it looks like each wheel/tire combo is about 2.5lbs heavier than the stock setup. I guess that adds up! I'm sure the wider contact patch and slightly stickier "performance" tires add to it as well.

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post #7 of 13 (permalink) Old 09-14-2013
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Mine dropped about 1.5 mpg on the highway when I went from stock tires to max performance summer tires with wider width.

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post #8 of 13 (permalink) Old 09-14-2013
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I lost about half an mpg going from 225 to 275.
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post #9 of 13 (permalink) Old 09-15-2013
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weight definitely seems like as much or more of a factor than width. i went from the stock v6 wheels/tires to gt wheels/tires. could easily tell weight difference by simply picking them up. only 225 to 235, but the added weight meant about 2-3 less mpg. i get 23-24 now in 50/50 mixed driving. can flirt with 30 going 60 mph.

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Quote:
Originally Posted by AirVenture View Post
For those of you who have upgraded to wider tires on your V6, how much of a mile per gallon hit did you take?

Originally I had 225-wide Goodyear Radial T/A (all season) tires and now use 255-wide Bridgestone Potenza (all-season) tires. The offset of the new rims also seems to push the tires out into the slipstream a bit too. I went from a typical commuting average of 27 down to 24 at best. I've played around with tire pressures a bit, and haven't noticed a change.

My commute is pretty short, but I'm just wondering what other peoples experiences are in case this isn't normal.
Did you get a new tune to adjust the speedometer for the shorter tire diameter?

If not then you really don't know what the fuel economy hit was because the speedometer is off and giving false readings to the pcm making the mileage readout incorrect as well as the odometer meaning you can't even calculate the mileage correctly either.

This is going to be the biggest reason you are getting so much lower of a mpg number.

Fix that and I bet the mileage hit will be no more than 1/2 a mile per gallon.
_

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post #11 of 13 (permalink) Old 09-15-2013 Thread Starter
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Quote:
Originally Posted by Ltngdrvr View Post
Did you get a new tune to adjust the speedometer for the shorter tire diameter?
_
Yup! My BAMA tune is adjusted for the new tires.

2011 V6 Base Grabber Blue GBMR #082
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Quote:
Originally Posted by AirVenture View Post
Yup! My BAMA tune is adjusted for the new tires.
Well, you must be driving it differently then(enjoying it too much), even if you don't realize it, to be losing 3 mpg.

When you changed the tune for the shorter tire, did you use the revolutions per mile setting in the tuner or what?

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Weight is a performance and MPG killer, specially rotating mass.
I ditched the 235 A/S Pirellis for 255 General G-MAX A/S tires, performs way better than stock, my gas mileage is the same to slightly better. Love these tires.
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