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  #11  
Old 01-26-2011, 06:16 PM
jokkling jokkling is offline
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Originally Posted by KennyPowers View Post
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!
Well I do complain because I live in Sweden and we pay about twice the price you pay for our fuel. But I'm not stupid (doh!), I realize all trucks uses a lot of fuel, that's not why i brought this up. I'm just curious if people actually did any serious mpg-calculations. Just for knowledge.
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Old 01-26-2011, 07:43 PM
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KennyPowers KennyPowers is offline
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Originally Posted by jokkling View Post
Well I do complain because I live in Sweden and we pay about twice the price you pay for our fuel. But I'm not stupid (doh!), I realize all trucks uses a lot of fuel, that's not why i brought this up. I'm just curious if people actually did any serious mpg-calculations. Just for knowledge.
No problem. Please note, that statement wasn't directed towards you. It was just a general observation.
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  #13  
Old 01-26-2011, 07:52 PM
jokkling jokkling is offline
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No problem. Please note, that statement wasn't directed towards you. It was just a general observation.
No worries, man. I totally get your point and I kind of agree with you.
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  #14  
Old 01-26-2011, 09:04 PM
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I have to agree with the both of you guys as well. If you buy a big truck and want to modify it then the last thing you should worry about is your MPG. I can totally understand if you are in Europe since the price is much more for PETROL!
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  #15  
Old 01-26-2011, 10:42 PM
Jack Nasty Jack Nasty is offline
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I had an '04 with 33's on it and by the odometer it calculated at 14 or so. I never had the computer reset for the difference in tire size, so I checked my speed with my handheld GPS and it showed my speedometer off by approx. 10%. Speedometer reading 50, GPS showed 55, Speedometer reading 70, GPS showed 77. Therefore I was traveling 10% further than the odometer showed. I would just factor this into my mileage calculations, which obviously put me about 15 to 15.5 mpg. Same situation with my '10, came out at 16 or so, then I adjusted the tire size with my new predator and it calculates out straight at 16 or so.
Never checked either with factory tires, but I'm sure it would have better.
Larger tires will load the engine a little more = less mpg. I could really feel it in the '04 (4.7), not so much with the '10 (5.7).
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  #16  
Old 01-27-2011, 02:23 AM
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Originally Posted by Jack Nasty View Post
I had an '04 with 33's on it and by the odometer it calculated at 14 or so. I never had the computer reset for the difference in tire size, so I checked my speed with my handheld GPS and it showed my speedometer off by approx. 10%. Speedometer reading 50, GPS showed 55, Speedometer reading 70, GPS showed 77. Therefore I was traveling 10% further than the odometer showed. I would just factor this into my mileage calculations, which obviously put me about 15 to 15.5 mpg. Same situation with my '10, came out at 16 or so, then I adjusted the tire size with my new predator and it calculates out straight at 16 or so.
Never checked either with factory tires, but I'm sure it would have better.
Larger tires will load the engine a little more = less mpg. I could really feel it in the '04 (4.7), not so much with the '10 (5.7).
Tony
That's exactly what I'm talking about, you get an actual milage somewhere in between the stock and what you get without compensating your calculations for bigger tires. The conclusion is, in my opinion, that you get a lower milage with bigger tires, but not as bad as many think.
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  #17  
Old 01-27-2011, 02:27 AM
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Originally Posted by ScatPak07 View Post
I have to agree with the both of you guys as well. If you buy a big truck and want to modify it then the last thing you should worry about is your MPG. I can totally understand if you are in Europe since the price is much more for PETROL!
Yeah, tell me about it. Today I payed $2.16 per liter. That's 58 cent per gallon (If google is right converting it for me). But I still don't want to drive around in some Nissan Micra. I want a bad ass American truck!
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Old 11-18-2012, 10:46 PM
bkemdano bkemdano is offline
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The two things all men lie about. Sex & gas mileage.
When you correct the trucks ECU with the updated tire size, your odometer and speedometer will read correctly. If you then travel the same roads at the same speeds I'm sure you will find you do Not get better mileage. I'm positive it will be worse to some degree, but I do understand your point.
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  #19  
Old 11-20-2012, 09:58 AM
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I was running some 35's on my truck with a 6" lift and I was driving around in tow/haul an I was getting 14.8 according to the computer and I drive about 60 miles a day up and down hills and going between 25- 65 mph and it was constant like that until I got some 37's. That's just my .02 tho, i have 3.55 gears and it never down shifted going up any hills so I think that's maybe a reason why my mpg is a little better
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  #20  
Old 11-20-2012, 10:50 AM
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Originally Posted by white4x4 View Post
I was running some 35's on my truck with a 6" lift and I was driving around in tow/haul an I was getting 14.8 according to the computer and I drive about 60 miles a day up and down hills and going between 25- 65 mph and it was constant like that until I got some 37's. That's just my .02 tho, i have 3.55 gears and it never down shifted going up any hills so I think that's maybe a reason why my mpg is a little better
What are you getting now with the 37's
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