Would gas mileage suffer?
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Would gas mileage suffer? - 8/4/2006 6:54:27 PM
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1996BZR
Posts: 421
Joined: 3/5/2006
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I plan to upgrade from the stock 205/75/15 tires to 235/70/15. I have been getting ~25 mpg with the 205's. Would my gas mileage suffer after the change of tires? If so, how much? I tried a search to answer the question, but couldn't find another thread about it, so if anyone remembers where there is another thread that answers my question, point me in the right direction. thanks
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1996 Blazer 4-door 2WD 572 V8
(just kidding, it's a 4.3 V6)
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RE: Would gas mileage suffer? - 8/4/2006 8:51:31 PM
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4lowlife
Posts: 1561
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It will suffer. The 235 are wider so ther is more ground contact. More resistance. Plus the speedo and OD wil be off. A dealership can rescan the PCM to correct the speedo and OD to your tire size.
I think the ride will be better than the pizza cutters you have on there now. I would get 235/75/15 installed. Then the recalibration done.
Do you hand calculate your gas mileage BTW?
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RE: Would gas mileage suffer? - 8/4/2006 10:19:11 PM
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1996BZR
Posts: 421
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yea. I would fill it up and reset the odometer. when I went to the station this morning to get gas I filled it up with a little more than 14 gallons and went 346.2 miles. So I rounded up to ~25. This is all highway, no stop lights or stop signs, going 60-70 the 120-something mile roundtrip. I can't decide whether to get 235/70's or 235/75's. How much would the speedometer be off comparing the two?
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1996 Blazer 4-door 2WD 572 V8
(just kidding, it's a 4.3 V6)
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RE: Would gas mileage suffer? - 8/5/2006 11:08:52 PM
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1996BZR
Posts: 421
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well that calculator says that if I upgrade to 235/70 then i am at risk of brake failure. it says anything over 3% is and 235/70 is 3.05% but i don't think .05% will matter.
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1996 Blazer 4-door 2WD 572 V8
(just kidding, it's a 4.3 V6)
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RE: Would gas mileage suffer? - 8/5/2006 11:17:12 PM
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flowmasta
Posts: 302
Joined: 7/21/2006
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man your doing the same calculations im trying to do....my 17 inch rims dont have enough tire right now and i want a big beefy set of like bf goodrich or something but i dont know what size would a) fit and b) my truck would be able to handle...braking etc.
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RE: Would gas mileage suffer? - 8/6/2006 2:48:24 PM
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1996BZR
Posts: 421
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I think I'm just going to go with 235, but I don't know whether or not 75 or 70. I guess I'll just get whatever size they have in stock of the style tire I want. I have friends that have put 20's and 22's on their vehicles with no braking problems, so I don't think I'll have a problem. I hate doing math before school starts
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1996 Blazer 4-door 2WD 572 V8
(just kidding, it's a 4.3 V6)
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RE: Would gas mileage suffer? - 1/29/2007 8:55:35 PM
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vansterdam
Posts: 3
Joined: 1/29/2007
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I just checked out that tire size calculator too. It's a good tool. Just over 3% should be fine on a truck. I think the calculator just gives that big warning for liability reasons. If you're worried, just beef up the suspension and brakes while you're at it.
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RE: Would gas mileage suffer? - 1/29/2007 11:13:29 PM
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Hanr3
Wheels & Tire Moderator
Posts: 3476
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I went from 235/75R15 to 30x9.5" tires and just replaced the original rear disc brakes. I have 132,000 miles on the rear brakes, 100,000 of that on the 30" tires. The dealer replaced the front brakes when the truck had 27,000 miles, it now has 132,000 miles and I still have plenty of pad left. I drive 70%highwy 30% around town.
Its all in how you drive.
Your fuel mileage isnt changing that much, its the numbers you use to calculate it that are changing. Tire size, odometer readings. Tehy will not be correct unless you get them adjusted for the larger tires.
_____________________________
"Some people spend an entire lifetime wondering if they made a difference.
The Marines don't have that problem."
-President Ronald Reagan
'87 S10-Blazer - SOLD
'93 S10-Blazer 4x4x4 - Sons DD, engine swap is done.
'00 S10-Blazer 4x4x4 - My
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RE: Would gas mileage suffer? - 1/30/2007 1:00:20 AM
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DankBlazer
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How does swapping tires affect braking? And typically how much does it cost to have your speedo / etc recalibrated for new tires?
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RE: Would gas mileage suffer? - 1/30/2007 10:20:20 PM
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Hanr3
Wheels & Tire Moderator
Posts: 3476
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I thought I ansewered the braking question. Depends on how you drive. In most cases the tire change mentioned in this thread wont have any noticeable effect on braking.
How do you get it recalibrated? Go to the dealer, call them and ask. Around here its .7 of an hour labor rate, about $60. Or you could by a programmer for $350 and do it yourself.
_____________________________
"Some people spend an entire lifetime wondering if they made a difference.
The Marines don't have that problem."
-President Ronald Reagan
'87 S10-Blazer - SOLD
'93 S10-Blazer 4x4x4 - Sons DD, engine swap is done.
'00 S10-Blazer 4x4x4 - My
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