Hypertech Speedo with 37s
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Junior User
Joined: May 2017
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Hypertech Speedo with 37s
Wondering if anyone has installed this so they could actually get a correct MPG drop on running 37s...I understand the MPG calculator is not very accurate according to most people on these trucks.....My question is since the odometer has been corrected on the truck with the hypertech has anyone actually been able to correctly determine the MPG loss of running 37s?.....My trucks lifetime average is 17.4 only because I haven't reset the trip #1.....I hand calculate a lot of my fill ups and consistently get around 18 mpg. That is cruising around 75 and on a zero grade mostly and no towing. The truck has the 6.7L with 3.55s and 20 inch rims right now.....I'm leaning towards staying with 35s and just a level to try to keep the truck getting semi descent MPG but I love the look of 37s on these trucks with a small lift. Let me hear your opinions remember this is only my opinion also. Thanks
Freshman User
Joined: Jul 2017
Posts: 36
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From: Orlando
I have 37's and the hypertech correction. I drive an even mix of highway and craptastic city traffic. I have the 3.55 gears and I had the larger 34" stock tires on the 20" rim. I averaged according the dash about 17.2 mpg with the stock tires, and now on the 37's with 22" rims I average 14.1 mpg.
I know the MPH is correct but I haven't taken the time to verify MPG by hand. I'll do that to see what it comes up with over the next few fill ups.
I know the MPH is correct but I haven't taken the time to verify MPG by hand. I'll do that to see what it comes up with over the next few fill ups.
Junior User
Joined: Mar 2017
Posts: 56
Likes: 0
I have 37's and the hypertech correction. I drive an even mix of highway and craptastic city traffic. I have the 3.55 gears and I had the larger 34" stock tires on the 20" rim. I averaged according the dash about 17.2 mpg with the stock tires, and now on the 37's with 22" rims I average 14.1 mpg.
I know the MPH is correct but I haven't taken the time to verify MPG by hand. I'll do that to see what it comes up with over the next few fill ups.
I know the MPH is correct but I haven't taken the time to verify MPG by hand. I'll do that to see what it comes up with over the next few fill ups.
Does the hypertech also compensate the shift points so that the trans isn’t shifting too soon? I used to have an Expedition with a lift 35” tires and 4.56 gears, without the tuner to adjust for tire size and gear ratio it would be in high gear at 30 mph.
Freshman User
Joined: Jul 2017
Posts: 36
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From: Orlando
Cross-Country
Joined: Jan 2017
Posts: 56
Likes: 0
mine works fine and it has been in for 6 months. Had to take it out and adjust the numbers to get it as close as possible a couple times. Now I am 69.8 on GPS when doing 70 on dash. But much better than being off by 6mph at 70
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