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  #1  
Old 01-25-2011, 01:26 PM
jokkling jokkling is offline
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Default MPG / Wheel Size

Ok, so I was just thinking. Everyone is pretty convinced that putting bigger tires on your truck will lower the milage. But how many of you calculate with that your truck will travel a grater distance with bigger tires? I mean, let's say you have 28" stock tires and put on 35" tires. The perimeter is about 25% longer on the 35" tires. If you don't compensate by this when you calculate your new mpg then you will get a incorrect mpg. Let's say your mpg was 15 with the stock tires. then with the new tires you will get 12 mpg traveling the exact same distance using the exact same amount of fuel.

In theory putting on bigger tires would be the same as swapping to low gear axles - which in most circumstances uses less fuel.


Excuse my crappy English, I'm from sweden...
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Old 01-25-2011, 02:54 PM
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I think your logic is a little flawed. Larger tires are heavier and have a larger diameter, therefore they require more power to turn them and keep them turning. Period.
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Old 01-25-2011, 03:33 PM
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^^What he said^^
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Old 01-25-2011, 04:06 PM
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Quote:
Ok, so I was just thinking. Everyone is pretty convinced that putting bigger tires on your truck will lower the milage. But how many of you calculate with that your truck will travel a grater distance with bigger tires? I mean, let's say you have 28" stock tires and put on 35" tires. The perimeter is about 25% longer on the 35" tires. If you don't compensate by this when you calculate your new mpg then you will get a incorrect mpg. Let's say your mpg was 15 with the stock tires. then with the new tires you will get 12 mpg traveling the exact same distance using the exact same amount of fuel.

In theory putting on bigger tires would be the same as swapping to low gear axles - which in most circumstances uses less fuel.

That's something I would tell my girlfriend/wife in order to justify my bigger lift and tire purchase.
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Old 01-25-2011, 06:11 PM
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usually when you put bigger tires you are also putting wider tires which creates rolling resistance.so even if you are traveling the same distance ,more distance,or even less distance you are using more gas no matter how you calculate it!!!
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Old 01-25-2011, 08:48 PM
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Funny thing is that he is right. Sorry to burst all your bubbles.

Yea on the highway you will get better MPG since you lowered the gear ratio of the truck. When your in the city you will have less since you are carrying more weight. In my truck I actually gained some MPG when on the high way a lot. After a while the MPG stayed about the same on my computer.

This concept is messed up but it works.

For the smart asses out there, yes I did change my speedo haha. My truck with a 6" lift and 35" tires gets over 13 MPG average. That is the norm for the 3rd gen Rams, at least mine was when it was stock.

If you do lots of city, or mostly city then you will notice a hit in MPG since your trucks working harder to move those big basterds

I know everyone is going to argue with me on this one hahahahaah
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Old 01-26-2011, 05:20 PM
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Yeeeeah, I'm not buying it. Sorry.
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Old 01-26-2011, 05:57 PM
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Well, I don't doubt that bigger tires will decrease your milage in the end. But I don't think it's as bad as many thinks. I mean, come on, none of you can't deny the fact that you travel a greater distance with bigger tires, which won't show on your odometer, right?
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Old 01-26-2011, 05:58 PM
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Quote:
Originally Posted by ScatPak07 View Post
Funny thing is that he is right. Sorry to burst all your bubbles.

Yea on the highway you will get better MPG since you lowered the gear ratio of the truck. When your in the city you will have less since you are carrying more weight. In my truck I actually gained some MPG when on the high way a lot. After a while the MPG stayed about the same on my computer.

This concept is messed up but it works.

For the smart asses out there, yes I did change my speedo haha. My truck with a 6" lift and 35" tires gets over 13 MPG average. That is the norm for the 3rd gen Rams, at least mine was when it was stock.

If you do lots of city, or mostly city then you will notice a hit in MPG since your trucks working harder to move those big basterds

I know everyone is going to argue with me on this one hahahahaah

mine gets better to on the highway (down hill)
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Old 01-26-2011, 06:09 PM
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You also have to factor in aerodynamics. Suspension lift + larger tires and wheels means you're sitting higher. Thus, creating more drag. At the end of the day I laugh when people complain about their mpg in a truck. It's a heavy vehicle with a big engine! Who cares what the mpg is!
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