New wheels= pos gas mpg
#1
New wheels= pos gas mpg
I just bought some 265-70-17 Nitto All Terrian and i love how it came out. I have a 06 f150 2wd 4.6 and i thought it was getting good gas milege. The only thing i have done to it was a front bumper and a exhaust but when i put the tires on i noticed the gas started sucking it down. I thought it was because i was about 3,000 miles over my oil so i changed. What do yal think?
I use to drive about 45 min away and get half a quarter and now just driving around today i wasted a whole quarter tank.
I use to drive about 45 min away and get half a quarter and now just driving around today i wasted a whole quarter tank.
#2
I have a 2004 SCrew with the 4.6 and put the Geolander 265/70/17's on mine. Fuel mileage fell 20% over night. The original tires, Continentals, carried a max air pressure of 44lbs. The Geos have a max at 35 lbs. Even at max pressures the Geos would suck gas. I'm now running 42 lbs of air in them and have most of the fuel mileage back. I have no odd tire wear and I've put about 20,000 miles on them like that. You might see what the tire pressures are as written on the side of the tire and max them out. If it's 35 lbs max, I'd add another 5 lbs and watch for any odd tire wear. You might also check them for heat. If they are running hot, not warm, hot, they have loads of rolling resistance and yer gonna have to deal with it. And remember, the tire pressure as it appears on the door jamb is for a nice comfy ride for the tires that came on the truck. Ford has never made tires and you need to go by the tire makers recommends. Most have a safety margin of 15lbs constant built in to the design. Running them at 10lbs over usually won't hurt the tires but you can end up with odd tire wear. Just watch them if you go over the pressure on the side walls.
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Tires and mileage
Paul
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First, I think you need to measure fuel comsumption a little better. Judging your mileage by the gas gauge meter moving "half a quarter" and from 45 minutes of driving is not a good way of doing this. Most people use MPG (miles per gallon). You also need to do this through several tanks of gas to obtain an average.
#11
I moved up from a 255/70/16 to a 265/75/16 and that was enough of a change to warrant a speedo/odo recalibration. I too thought my mpg's went way down, as I was still using the odo miles as a reference, which was LESS miles then actual.. (until I was informed of that fact from this very site!!)
After I re calibrated the speedo/odo and I recalculated my mpgs, I was back to basically where I was at before..
This was way back in 2001 when I did all this, and my mpg's have been consistent ever since then. I'm on my third set of 265/75/16's.
Mine are "LT" rated tires, so the max psi for them is 50 psi. For everyday use, I run them at 40 psi in the rear and 44 psi in the front. When I tow, I bump them all up to 50 psi.
I get about 60,000 + miles out of a set of tires and when I replace, it's well before the tread is to the official 'wear marks' too... I see a huge falloff in tire performance when they get about 60% worn....
Anyway, like was said above, verify how you're computing your mpg's by dividing your 'actual' miles traveled by the # of gallons of gas used and do that over several tanks of gas that you will get your 'average' mpg..
I do know that in the 8 years I've been driving my truck, if I go 100 miles on the first quarter of a tank, then I'm right at my 'average' unloaded and mostly hwy mile mark. If I'm at 200 or so miles by half a tank, then I'm still on target.... What's interesting, is I can only go another 100 miles on the last half tank before the low fuel light comes on.. I'm sure it's probably due to the gas tanks design, as it's not a perfect "rectangle" by any means....
Anyway, you will probably find that once you get everything synced back up with the speedo/odo and calculate accordingly, things will be back to 'normal' again...
Mitch
After I re calibrated the speedo/odo and I recalculated my mpgs, I was back to basically where I was at before..
This was way back in 2001 when I did all this, and my mpg's have been consistent ever since then. I'm on my third set of 265/75/16's.
Mine are "LT" rated tires, so the max psi for them is 50 psi. For everyday use, I run them at 40 psi in the rear and 44 psi in the front. When I tow, I bump them all up to 50 psi.
I get about 60,000 + miles out of a set of tires and when I replace, it's well before the tread is to the official 'wear marks' too... I see a huge falloff in tire performance when they get about 60% worn....
Anyway, like was said above, verify how you're computing your mpg's by dividing your 'actual' miles traveled by the # of gallons of gas used and do that over several tanks of gas that you will get your 'average' mpg..
I do know that in the 8 years I've been driving my truck, if I go 100 miles on the first quarter of a tank, then I'm right at my 'average' unloaded and mostly hwy mile mark. If I'm at 200 or so miles by half a tank, then I'm still on target.... What's interesting, is I can only go another 100 miles on the last half tank before the low fuel light comes on.. I'm sure it's probably due to the gas tanks design, as it's not a perfect "rectangle" by any means....
Anyway, you will probably find that once you get everything synced back up with the speedo/odo and calculate accordingly, things will be back to 'normal' again...
Mitch
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