F150 leveled 275/70/18 MPG?
04-17-2014, 02:30 PM
#11
Senior Member
you can manually figure out your actual miles but it's a little more difficult. if you have 255/70/17's and went up to 285/70/17's for every 56.97 miles your odometer reads, you went 60 miles... so you take 56.97 divided by your mileage times 60 and that's how many miles you went... not sure of your original tire size or your current tire size (since the first number is width). but you can play around with this
http://tire-size-conversion.com/spee...r-calibration/
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K7White (04-18-2014)
04-17-2014, 03:28 PM
#12
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All 275/70/18 come in E rated, I have them in Nitto Trails and they are heavy! lost 2mpg and counting the days till I get all terrains instead.. Possibly in stock size.
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K7White (04-17-2014)
04-17-2014, 04:38 PM
#13
Junior Member
Thread Starter
I got a leveling and block kit for my 2011 ecoboost and put 285s on it. I went from getting 18 to 21 mpg's down to 15 to 17. I've been to two dealers and neither would recalibrate it for the larger tires. The truck doesn't struggle but the fuel economy suffers more than I had expected because the truck is kind of staying in "boost" or whatever. I've done the same thing with 2 other trucks and the most I ever lost was 2 mpg's.
I'm not going to buy a tuner to recalibrate because I don't want some a hole at the dealer to tell me I voided my warranty if I have an issue
I'm not going to buy a tuner to recalibrate because I don't want some a hole at the dealer to tell me I voided my warranty if I have an issue
04-17-2014, 05:42 PM
#15
i have 295/70/17's (33.3") that are pretty close to the same diameter as the 275/70/18's (33.2") but wider and mine are M/T's (so very likely heavier)... without the speedo re-calibrated and just going by what the Demeter says, I'm between 12-13 mpg so in actuality it's likely around 13-14 mpgs with my 3.55 gears (which is mostly city) without actually doing the math.
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K7White (04-18-2014)
04-18-2014, 09:44 AM
#16
Junior Member
Thread Starter
While considering the stock ko's tire size of 275/65/18 I came across something interesting. So I went to http://www.bfgoodrichtires.com/tire-...n-t-a-ko-tires
and found that the 275/70/18 ko's are only 2lbs heaver than the stock size 275/65/18 Ko's.
That being said, I'm dead set on the ko's so I may go with the 275/70? 2lb can't change the MPG that much. Hell, the stock size ko's are nearly 10lbs heaver than my stock tire goodyear wrangler at/s 275/65 that came on the truck!!!!!! I like the idea of 10ply,,, but DAMN!!! Apparently bfg's = heavy.
and found that the 275/70/18 ko's are only 2lbs heaver than the stock size 275/65/18 Ko's.
That being said, I'm dead set on the ko's so I may go with the 275/70? 2lb can't change the MPG that much. Hell, the stock size ko's are nearly 10lbs heaver than my stock tire goodyear wrangler at/s 275/65 that came on the truck!!!!!! I like the idea of 10ply,,, but DAMN!!! Apparently bfg's = heavy.
Last edited by K7White; 04-18-2014 at 09:47 AM.
04-18-2014, 10:32 AM
#18
Senior Member
I have a 5.0 so it's not an even comparison but after several changes I have not had my mileage change by more than +- 1/2 mpg.
Leveled, tuned (stock, 87 economy, 87 perf) Goodyear SRA, Cooper AT3( P rated 32"), Cooper ST Maxx (LT 33").
Leveled, tuned (stock, 87 economy, 87 perf) Goodyear SRA, Cooper AT3( P rated 32"), Cooper ST Maxx (LT 33").