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Old 10-29-2020, 05:02 PM #1
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Upgraded from 265s to 275s. lost acceleration and mpg

Will swapping gear fix this? Can I get the acceleration and mpg back? I went from 18mpg to 15.5mpg. And what does swapping gears? Do I swap the gears in the gear box or swap gears in the rear AND front diffs?
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Old 10-29-2020, 05:23 PM #2
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Will swapping gear fix this? Can I get the acceleration and mpg back? I went from 18mpg to 15.5mpg. And what does swapping gears? Do I swap the gears in the gear box or swap gears in the rear AND front diffs?
What tire and size? 275/70 r17, 285/75 r17? LT or P? Brand and model?

How are you measuring/ calculating mpg?

Gear swap is fed and rear differentials.

Good luck
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Old 10-29-2020, 05:41 PM #3
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Weight might be playing a factor too. What specific tires/size/load rating did you get?
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Old 10-29-2020, 05:48 PM #4
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Typical gear swaps means removing both front and rear axle differentials and changing the gear ratios so that a revolution of the drive shaft to each differential results in less rotation of the wheels.

The only gear ratios available are what you have now - 3.73. And then there exists 3.91 from the Lexus GX and then the gears available jumps to 4.56. 4.56 gears would match with 39" tires. You've gone from 31.6" tires to about 32.1" tires. It's unlikely that gearing for about 39" tires would help your mileage.

I would start by making sure your tire pressures are correct. With LT rated tires - you should be running around 40-45psi. That may help some. But also they are heavier and higher rolling resistance.
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Old 10-29-2020, 06:50 PM #5
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I don't think gear swap is going to much good with switch to only 275s.

Part of the price to pay when going bigger.
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Old 10-29-2020, 07:09 PM #6
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I'm assuming this is going to be a stock road oriented tire (like the Dunlops) over to something much more aggressive and heavy (maybe C-rated Falken AT3Ws)?

Some of the MPG loss is almost certainly related to weight and tread pattern, not the tire size alone. Even if you swap from the stock OEM highway tires over to a more aggressive C or E load 265/70R17, you're probably going to see your MPG go down by around 1 at minimum.
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Old 10-29-2020, 09:42 PM #7
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Quote:
Originally Posted by Johncmng View Post
Will swapping gear fix this? Can I get the acceleration and mpg back? I went from 18mpg to 15.5mpg. And what does swapping gears? Do I swap the gears in the gear box or swap gears in the rear AND front diffs?
Nope. That's why new cars usually come with lame tires. Long wear, low rolling resistance.
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Old 10-29-2020, 10:13 PM #8
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now you need a supercharger and a gearing change. the cycle continues.
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Old 10-29-2020, 10:18 PM #9
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I run 285s and avg mid 17 mpg.
I have a 12 mile, 6% grade to go up and down to get to work.

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Old 10-29-2020, 10:50 PM #10
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I'm two weeks in going from 265 stock dunlops to 285 atIIIs, so far no real need to go for a gear swap just yet but I have almost zero added weight. I do want a super charger though..
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Old 10-29-2020, 10:56 PM #11
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I’m running 285’s n my mileage is 17.4. I noticed a slight decrease in performance but for the price of a gear swap, it’s easy to ignore.


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Old 10-29-2020, 11:24 PM #12
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Old 10-29-2020, 11:27 PM #13
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Quote:
Originally Posted by Dillusion View Post
I don't think gear swap is going to much good with switch to only 275s.

Part of the price to pay when going bigger.
This right here ^^^

Gotta pay to play.

Re gearing is a costly upgrade. Be prepared to put out some coin.

I run 285/70/17 Falken Wildpeak MT’s. Heavy ass tires. I average 15mpg

16 on a good day.
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Old 10-29-2020, 11:35 PM #14
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So you added 15lbs or so to each corner, and increased the surface area and rolling resistance, but you're surprised that the engine needs to burn more dino juice to do the same speed on the highway than it did before the new rubber?

Takes all sorts I suppose...


Re-gear will cost you about $3 - 4k in parts and labour



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Old 10-29-2020, 11:37 PM #15
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Quote:
Originally Posted by Johncmng View Post
Will swapping gear fix this? Can I get the acceleration and mpg back? I went from 18mpg to 15.5mpg. And what does swapping gears? Do I swap the gears in the gear box or swap gears in the rear AND front diffs?
When I went from the factory 265's to 275 KO2's in a E load I lost about 1.5 to 2 miles per gallon. The E load 275 weighs a hefty 58 lbs. as I recall, and that is the major reason for the loss of acceleration and gas mileage. I went to 285/70-17 Falken AT3W's in a Standard Load (SL) with a weight of 51 lbs. each. My gas mileage improved by .5 to 1mpg over the 275's.
Acceleration seems to fine in all conditions with the 285's. I drive 5 miles to work by street and go through an elevation change of 1400 feet up and down. I consistently get 15-15.5 mpg doing this. I use to get 14.5-15mpg with the 275's. I would not waste money on a gear change. The 275's actually put the speedometer right on the money and the 285's are only 1mph off.
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