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Discussion Starter · #1 ·
I went from the stock 265/65/17 and getting 22.2 mpg at 65 mph to 265/70/17 Terra Grapplers and now get 18.5 at 65. I know My tire size changed my dash reading by like 1.2 mph or something, but that doesn't account for nearly 4 mpg. I knew it would affect it some just not that much. I guess it is what it is now!!!
 

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its prolly cuz your speedo is off and throwing your odo off a few therefore its not being calculated correctly



why are you complaining about mpg's? YOU OWN A TRUCK
 

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Discussion Starter · #4 · (Edited)
Ok let me make this clearer. If my Reading is 1 mph off and i drive a tank of gas out of about 325 miles and done all HWY driving at 60 mph .I would drive about 5 or 6 miles futher than my odometer tells which does not account for 3 or 4 mpg. Is my math right?

I was expecting or I guess hoping may be a better word to only lose around 1 mpg. LoL
 

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Your math would be right, but if the tires are larger and weigh more they will put a greater drag on the driveline that can't be accounted for in your math.
 

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try weighing ur tires...i went from 14-15 mpg with stock Nismo's to 285/75/16 KM2's. i'm now at 12.5-13mpg.
 

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yea it's not the size of the tires, it's the extra weight. every lb of weight on the brake/wheel/tire combo is roughly equivalent to 7 lbs so if you went up 10 lbs at each corner that's 280 (roughly) simulated lbs of resistance you've added. i went down about 1mpg going from 265/70 road tires to 265/75 TG's
 

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I average around 13 with 295/75/16 Terra Grapplers. The size, weight, and tread pattern all play a role. But like others have already said, its a truck.

Not sure how you ever got 22 on a 4x4 though. I think I started around 17-18
 

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I don't keep track of mpg anymore.

Step 1) Put gas in
Step 2) Drive
Step 3) When the low fuel light comes on refer to Step 1
 

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why are you complaining about mpg's? YOU OWN A TRUCK
What is wrong with wanting the best possible efficiency? Diesel-Electric locomotives are engineered to use the least amount of fuel possible. Semi-tractors are designed to be as efficient as they can.

Reducing fuel consumption and reducing fuel expenditures is not only good for the owner and operator, but good for everybody.
 

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I used to get 17-21mpg on my 2006 cc se 4wd. Now with the 265/70/17 Terra grapplers I average 16mpg city And hiwgway combined. That's why I'm selling my wheels and going with my stock rims and a 265/75/16 general grabber ht! I've heard nothing but good things about these tires. I don't wheel enough to justify a/t or m/t tires like I used to have.
 

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wait....you went to a larger diameter, heavier tire with more aggressive tread pattern and your MPG went down!?!?! Get out of here! No way!?
 

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What is wrong with wanting the best possible efficiency? Diesel-Electric locomotives are engineered to use the least amount of fuel possible. Semi-tractors are designed to be as efficient as they can.

Reducing fuel consumption and reducing fuel expenditures is not only good for the owner and operator, but good for everybody.
There's nothing wrong with wanting the best efficiency but if that's your aim don't put bigger tires on and when you do there's not need to complain about your MPG's going down. If I see above 15 MPG I'm happy
 

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yeah seriously, if you wanting the mpgs. dont put bigger tires and lift your truck. simple. and if you do and see a drop in mpg when you choose to do so please dont post threads whining about the loss of miles per gallon.
:fantastic:
 

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I used to get 17-21mpg on my 2006 cc se 4wd. Now with the 265/70/17 Terra grapplers I average 16mpg city And hiwgway combined. That's why I'm selling my wheels and going with my stock rims and a 265/75/16 general grabber ht! I've heard nothing but good things about these tires. I don't wheel enough to justify a/t or m/t tires like I used to have.
be sure to calculate the cost of the new tires, and the loss you take on your aftermarket wheels and tires when determining how much money you "save"
 

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I must have failed to explicitly say you can't have your cake AND eat it too. While I agree that the OP should have expected such an outcome, he is more than welcome to discuss it here. If a member doesn't like MPG threads then they certainly don't have to open one up.
 
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