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  #13  
Old 11-26-2013, 04:31 PM
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Re: Gas mileage after new tires - Whine with my cheese

I went from pic #1 to pic #2 and couldn't stand it. I lost gas mileage, braking, handling, was loud, and my speedo was off 1-3mph depending how fast you were going. Of course I knew all of this as I had these tires on my Wrangler for years but it completely ruined the ride of the Grand. Then I went to pic #3 and got all my ride quality back.

Pic 1: stock 17'' Laredo wheels and tires
Pic 2: stock 17'' Laredo wheels with 255/75/17 BFG KM M/T's (Wrangler Rubicon tires)
Pic 3: stock 20'' Overland wheels and tires





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  #14  
Old 12-05-2013, 09:54 AM
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Re: Gas mileage after new tires - Whine with my cheese

I have the 2011 Limited 18" and happy as I get between 22-25 on the highway. The tires came with the vehicle when I bought it at 36K, they are your basic Kelly all season light truck tires, but they are very quite, they work decent off road, and in foul weather.

I had a 2004 GMC Envoy with a similar v6 engine, but a heavy duty towing package, and skid plates…. I drove it for 5 years and the average over those years on the highway, streets and off road (which was very limited) was 16.6 MPG. In NY where gas is extremely expensive…Over $3.69/gallon, while many states are sub $3 a gallon. I am very happy to get the kind of mileage I get, as well as decent power as well.

Hard when coming from a sedan that was getting 29-30mpg most often. I still prefer the SUV for the convenience factor.

I'm glad people are putting tire brands as there will be a day that these need to be replaced and light truck/passenger tires very a lot in quality, noise and traction. Thanks for the info.
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Old 12-05-2013, 11:32 AM
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Re: Gas mileage after new tires - Whine with my cheese

If you are going to keep the tires, you can get the control module flashed with the new size tires to make it more accurate (both the odometer and the MPG indicator). Depending on tire size the dealer can do it or there are a lot of 'tuners' you can buy that will let you do it (plus adjust other things as well)
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Old 12-05-2013, 12:49 PM
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Quote:
Originally Posted by kkreit01 View Post
Try calculating manually, and adjust miles for your tire size. This is common when upsizing, or switching from highway all-season to an aggressive A/T tire. You did both. You also take a hit with winter gas. 4 MPG is quite a bit. There are too many factors in mpg. You can't make an assumption based on 1 trip or 1 tank. You have to average over time. Wind, temp, terrain, etc. all make a significant difference in mpg. Report back after 3 months, or back in Spring time -- when summer gas hits. Your speedo and odometer are both reporting lower than actual now.
I lost just under 4 MPG hwy between warm weather and cold weather+winterized gas. I was hitting 21.3 hwy DC to NY. Last trip after the temp drop I hit mid 17s same driving same route. Had way more traffic when I got the better numbers. Almost no traffic when it was cold thus past week.
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Old 12-05-2013, 06:43 PM
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Re: Gas mileage after new tires - Whine with my cheese

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Originally Posted by Zstairlessone View Post
If you are going to keep the tires, you can get the control module flashed with the new size tires to make it more accurate (both the odometer and the MPG indicator). Depending on tire size the dealer can do it or there are a lot of 'tuners' you can buy that will let you do it (plus adjust other things as well)
Thanks for reminding me of this. My Jeep is at the dealership right now for some other stuff and I just called them to see if they can recalibrate. I doubt they'll be able to based on what I've heard, but it's worth a try.

Tony
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Old 12-05-2013, 06:46 PM
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Re: Gas mileage after new tires - Whine with my cheese

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Originally Posted by the1jake View Post
I feel your pain. Try adding rock rails and skid plates after swapping out tires.

Here is a link to an online calculator which will convert the speed from your previous tires to the present ones: Tire Dimensions Made Simple - Discount Tire
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  #19  
Old 12-10-2013, 03:36 PM
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Re: Gas mileage after new tires - Whine with my cheese

Those that have upgraded tire size and lost significant mpg, did you upgrade to a P or LT tire? I'm looking to upgrade to P275/65/18 since the LT is ~13-15 Ibs heavier per tire. It looks like the P275/65/18 tire would only be a 1-2 mpg hit with the V6, going from my research.
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Old 12-10-2013, 04:39 PM
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Re: Gas mileage after new tires - Whine with my cheese

My tire is a T-110 type Kelly Safari Special. 18". Have been getting pretty good gas mileage 19 mixed, 22-25 highway they are very quite compared to a more aggressive trail type tire. An extra 60lbs shouldn't hurt your mileage at all. The truck tires do put the JEEP a bit higher up and that may have minor mpg differential, but they should also wear longer than the lower profiled tires. You won't win any cornering contests, but I take turns slow to maximize tire life and I also don't jam on the gas unless needed. I try to drive the Jeep similar to a motorcycle in as much as I want to keep the vehicle moving rather than stopping and accelerating all the time. That kind of driving keep you maximizing your gas mileage as much as possible in everyday life.
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Old 12-10-2013, 05:44 PM
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Re: Gas mileage after new tires - Whine with my cheese

They say rotational mass has far more affect than static mass...but I've not performed my own tests and I'm no scientist. I've seen reports of it being equivalent to 2x up to 8x the affect...lots of variables like a lift, rake, v6 vs v8, etc, etc. It would definitely have more effect with stop/go traffic or city driving...once you're going it's a non-factor. If it can affect 1/4 and 1/8th mile times, I don't see how it couldn't affect mpg...how much is the question...
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