tires vs. mileage
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Tuned
Joined: Oct 2003
Posts: 295
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From: Ringgold GA.
tires vs. mileage
Hello all.
Now that I have my Bronco running smoothly I was looking into a new set of tires for her. It came with 205/75-15's it now has 215/70-15's. I was looking into a set of 235/75-15's. How much will this affect my gas mileage? I'm hopeing for some feedback from people who have run or are presently running this size tire. Not really intrested in going bigger or lifting the truck because this is gonna be my "gas-sipper" commuter truck.
Now that I have my Bronco running smoothly I was looking into a new set of tires for her. It came with 205/75-15's it now has 215/70-15's. I was looking into a set of 235/75-15's. How much will this affect my gas mileage? I'm hopeing for some feedback from people who have run or are presently running this size tire. Not really intrested in going bigger or lifting the truck because this is gonna be my "gas-sipper" commuter truck.
Post Fiend
Joined: Jun 2002
Posts: 13,873
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From: Atlanta GA
It will not make much of a difference at all, if you could find a way to measure it because your speedometer will read slower.
It might seem like it effects your MPG, because the speedo is turning slower for every mile traveled, it really doesn't for that small of a tire increase with that computer system in the truck.
It might seem like it effects your MPG, because the speedo is turning slower for every mile traveled, it really doesn't for that small of a tire increase with that computer system in the truck.
Senior User
Joined: Feb 2004
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From: new braunfels ,tx
Originally Posted by rebocardo
It will not make much of a difference at all, if you could find a way to measure it because your speedometer will read slower.
It might seem like it effects your MPG, because the speedo is turning slower for every mile traveled, it really doesn't for that small of a tire increase with that computer system in the truck.
It might seem like it effects your MPG, because the speedo is turning slower for every mile traveled, it really doesn't for that small of a tire increase with that computer system in the truck.
Rub my Belly
Joined: Jan 2004
Posts: 3,093
Likes: 1
From: Lawrence, KS
Originally Posted by eveready77
Hello all.
It came with 205/75-15's it now has 215/70-15's. I was looking into a set of 235/75-15's. How much will this affect my gas mileage?
It came with 205/75-15's it now has 215/70-15's. I was looking into a set of 235/75-15's. How much will this affect my gas mileage?
Post Fiend
Joined: Jun 2002
Posts: 13,873
Likes: 3
From: Atlanta GA
Originally Posted by Aggie05
When im calculation MPG i dont know how many miles to add to my odometer,can you give me an equation or basic idea of how many miles to add for 31 10X50 r15 tires. Say for every 10 miles add 2 or something similar.
http://www.4lo.com/
If you want to figure out your MPG in an accurate way, then put a GPS in your vehicle. I have been using a Garmin GPS-72 for my vehicles stuck on thr dashboard.
Once I know 45 mph = 55 mph - I write it on a sticker and stick it on the dash You can add a reprogrammable speedo from Dakota Digital
http://www.dakotadigital.com
that will pretty much solve all the problems of larger tires.
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Tuned
Joined: Oct 2003
Posts: 295
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From: Ringgold GA.
Thanks for the info rebocardo. Hopefully my speedo wont be off too much with shuch a small increase in height. Standing side by side the 235/70-15's and the 205/75-15's have about 3/8" diffrence in height. so the 235/75-15's should be a bit taller, hopefully keep it within half to three quarters of an inch overall diffrence.
Posting Guru
Joined: Sep 2004
Posts: 1,915
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From: Yokosuka, Honshu, Japan
I got up to (by dumb calculations -- I'm guessing my speedometer was recalibrated with a new gear on the transmission end of the cable... if you need info for that, let me know...) 23 mpg with 235/75R-15s on my '87 with the stock 3.45 gears (at least I haven't verified if the tags are correct as far as what gears are installed). These little trucks don't have a whole lot of neck-jerking power anyhow... but I didn't notice that big of a drag on mine as far as acceleration. Just beware that larger tires do affect braking and brake wear.
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