2011 toyota tacoma

is there a big difference between a 265 65 r17 compare to a 285 70 r17 for gas mileage mine really sucks the fuel

 

will I lose between 5 to 6 mpg?

 

I wouldn’t run a bigger tire if I already didn’t like my MPG.
Rolling resistance and weight of tire will affect MPG.

It is highly unlikely you would loose 5-6mpg with that little of a tire change.
But some loss in mpg can be expected.

 

Welcome to TW!

Enjoy;

 

You will lose maybe 1-2 mpg. But hey, you're driving a truck, dont expect stellar economy.

 

Thanks for all your help. but I am lucky to get 11 mpg in town.

 

That seems a lit low to me?
Are you modded in any way?

 

Ummm your truck has a problem, get that checked out

 

no ck engine lights and has plenty of power. Had one shop run a scan and said all is good except the tires. which i'm not satisfied yet.

 

If you have access to a scan tool.
Maybe see where the LT Fuel Trim is running?
My understanding is Toyota used a generous threshold
on our trucks before a CEL and code were shown.
Some say +20% all the way to +30% before CEL.

Something doesn’t sound right to me.
Anything lower than 15 mpg, unless you are HEAVILY modified, makes me start looking at stuff.

There are a lot of guys on here that are more knowledgeable about reading scan diagnostics.
Until they chime in, here is a good starting point.

 

265/70/R17 with 3.73 gears about 17MPG brand new, watched it unloaded off the truck

285/70/R17 with 3.73 gears about 15MPG

35.5x13.8x20 with 3.73 gears about 11MPG

35.5x13.8x20 with 4.30 gears about 14MPG

 

Thank You very much. I just checked my speedo with a speedo app on my I phone, and when my truck was reading speedo at 70 mph I was actually doing maybe between 71 1/2 to 72 mph on my app.

 

LITTLE of a tire change?? Expect a 4-6MPG reduction.

 

7% difference in those two tires.

 

Tire rack quotes
58lbs/tire for 285/70/17 and 50lbs/tire for 265/65/17. That is 8lbs comparing like for like LT t/a k02’s.

It gets way worse when you look at a 38lb/tire p265/65/17 hankook dynapro or 40lb/tire Michelin defender. 20lbs per tire!

Unsprung rotating mass will eat MPG alive.

 

Crappy winter gas.

 

Good point about weight. If one of your concerns when buying tires is MPG, stick to a 'C' rated tire to save on weight. My 35's are 'E' rated and tire+wheel is about 90lbs each.

 

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