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Old 04-27-2014, 12:29 AM   #1
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New tires

I currently have p265/65r18 tires. I am looking at purchasing the following tires:
Dunlop Rover H/T
LT 275/65R18E1 123R W

Any thoughts about this purchase? Will switching tires screw up my fuel mileage or speedometer?

Randy
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Old 04-27-2014, 07:44 AM   #2
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it will screw up both, but i think both will be minor. speedometer you will be going 1 mph faster then your your gauage says. and lt tires weight more so lower fuel mileage
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Old 04-27-2014, 08:00 AM   #3
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What load range are they? The difference in size will have minor effect on mileage/speedometer.
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Old 04-27-2014, 08:10 AM   #4
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What load range are they? .
according to there web site they would be load range E
LT 275/65R18E1 123R W
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Old 04-27-2014, 08:16 AM   #5
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going from a P series to an LT is a much heavier tire. Both in weight and load capacity. Most likely a small mileage drop even when not towing due to extra weight of tires, but the increased load capacity will make towing safer
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Old 04-27-2014, 08:22 AM   #6
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X2 on the E-10 ply, its in the size #s.

I don't think that there will be any noticable difference in mpg or your spedo!

Here's a side by side comparison along with speed difference.
Tire #1 is your 265, tire#2 the 275.
Only about 1/2" difference in overall diameter, going to be very, very hard to impossible to tell any difference other than being a stiffer tire.


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Old 04-27-2014, 08:28 AM   #7
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the actual weight of the tires is what will drop MPG slightly, not the size. Tires are part of the unsprung weight of a vehicle, and being heavier, takes more power to get moving.
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Old 04-27-2014, 08:31 AM   #8
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the actual weight of the tires is what will drop MPG slightly, not the size. Tires are part of the unsprung weight of a vehicle, and being heavier, takes more power to get moving.
True, but it will be an infinitesimal amount of mileage difference and the rolling resistance will be less, so it will probably be a wash.
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Old 04-27-2014, 08:35 AM   #9
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True, but it will be an infinitesimal amount of mileage difference and the rolling resistance will be less, so it will probably be a wash.
It will be a minor difference if any. Really there are too many variables to make a call. We don't know what type of tire his current and new tires are, whether street/all-season tread or a more aggressive tread. That makes a big difference too.
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Old 04-27-2014, 08:46 AM   #10
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the actual weight of the tires is what will drop MPG slightly, not the size. Tires are part of the unsprung weight of a vehicle, and being heavier, takes more power to get moving.
X2. I once put a heavier tire on my VW Jetta. I lost 3 mpg on the highway. Also, if this is a "1/2 ton", make sure your rims are capable of accepting 80 PSI.
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