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Old 7/11/18, 11:44 PM   #1  
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Change in MPG with with tires?

I'm curious, for those who got rid of the stock 235's and went to 265 or 275 tires, how much of a change in MPG did you notice, if any?

I have a new 2018 GT base w/MT82, and I am averaging about 26mpg with my 40mi highway commute everyday. I have a sneaky suspicion it may be nice to upgrade to 19x9's and a set of 265's squared for winter driving when the roads get a little more slippery. A little more footprint for better traction. We get a lot of black ice here in the PacNW. Anyway, if I get a set of aftermarkets that actually weigh a couple pounds less, but a slightly bigger footprint, I can't help but wonder how much of a change to expect.
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Old 7/12/18, 05:59 AM   #2  
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very hard to say how much, but yeah it will probably go down a little; probably less than 1 MPG

Back when I first got my 2010 GT I used to get about 27 MPG on my highway commute; over the years as I made various modifications that dropped to about 24 or so . . . one of those modifications was wider tires and bigger diameter wheels, but it was mixed with other things so I can't say how much was due to the tires.
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Old 7/12/18, 07:37 AM   #3  
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I don't think you would notice much to be honest. The European GTs are premium so have the 19x9" 255/40 and rear 19.9.5" rear with 275/40s. I can get 30 plus on a motorway run and even mid to late 20s with a mix of highway and dual carriageway.
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Old 7/12/18, 07:39 PM   #4  
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Quote:
Originally Posted by Marco_GT
I don't think you would notice much to be honest. The European GTs are premium so have the 19x9" 255/40 and rear 19.9.5" rear with 275/40s. I can get 30 plus on a motorway run and even mid to late 20s with a mix of highway and dual carriageway.
Dual carriageway...is that two horses pulling the buggy? Just having fun with you!
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Old 7/13/18, 03:59 AM   #5  
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Dual carriageway...is that two horses pulling the buggy? Just having fun with you!

indeed. I don't think you have the equivalent in the US. I've never seen them. Most town main streets are like our motorways (freeways). A dual carriageway is two lanes in both directions usually with frequent roundabouts or traffic lights. I've not seen a roundabout in the US either, except in a park. ;-)

Last edited by Marco_GT; 7/13/18 at 04:00 AM.
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Old 7/13/18, 07:02 AM   #6  
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. . . . I've not seen a roundabout in the US either . . .
apparently you haven't been to "New England" :-)

but we call them "rotaries" just to be different
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Old 7/13/18, 08:07 AM   #7  
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Dual carriageway...is that two horses pulling the buggy? Just having fun with you!
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apparently you haven't been to "New England" :-)

but we call them "rotaries" just to be different
No I havn't been there. Rotaries, I like it.

Has to be said, I love driving in the states. Another road trip in September. Can't wait.
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Old 7/14/18, 11:40 AM   #8  
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Originally Posted by Marco_GT View Post
indeed. I don't think you have the equivalent in the US. I've never seen them. Most town main streets are like our motorways (freeways). A dual carriageway is two lanes in both directions usually with frequent roundabouts or traffic lights. I've not seen a roundabout in the US either, except in a park. ;-)
Marco, "Roundabouts" are even coming to my little area in the southern part of the United States. I saw my first one in New Jersey around 1981-82. The sign said "rotary ahead", and I had no idea what it was telling me until I got there. It should have also said, "if you're from the south do not move into the inside lane. If you do, you will be in the rotary for the rest of your life."
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Old 7/14/18, 11:51 AM   #9  
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I saw my first one in New Jersey around 1981-82.
Where in New Jersey were you?
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Old 7/15/18, 10:15 AM   #10  
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Where in New Jersey were you?
Heading out to Cape May.
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