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Old 12-11-2008, 01:00 PM
02ram47 02ram47 is offline
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Default MPG drop due to tire change

I have an 02 Ram 1500 SLT with 245 17inch tires. I put on my winter tires which are 265 17's and felt a drastic drow in my mileage. I didn't expect this much or a drop staying with 17 inch tires. Should the computer be adjusted or is a 2 to 4 mpg drop normal.
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Old 12-11-2008, 10:53 PM
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Take into account that the overhead console calculates MPG as an average fuelflow/distance rate. And that distance is measured upon standard diameter wheels. If you put larger wheels, "distance" won't be the same. So the quotient fuelflow/distance varies also...
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Old 12-11-2008, 11:16 PM
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http://www.miata.net/garage/tirecalc.html

Go here and you will see the size difference. Take that difference in % and multiply that by how many miles you drive before filling up. This will be around 4% by what I can tell. Add what you get to your total mileage and that is the actual miles you have drove.

Example: You drive 250 miles before empty and then fill up at 19 gallons.

250 miles X 4% = 10 miles...... So that gives you 260 miles.

260 miles / 19 gallons = 13.68

Instead of: 250 miles / 19 gallons = 13.15

Little better. You also have to take into consideration the rolling resistance of the new tires + the weight difference + the fact that you have now numerically lowered your gear ratio. Around town bad ====== Interstate Good.

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Old 01-12-2013, 11:58 PM
Oldy but goodie Oldy but goodie is offline
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Quote:
Originally Posted by boostjunkie1 View Post
http://www.miata.net/garage/tirecalc.html

Go here and you will see the size difference. Take that difference in % and multiply that by how many miles you drive before filling up. This will be around 4% by what I can tell. Add what you get to your total mileage and that is the actual miles you have drove.

Example: You drive 250 miles before empty and then fill up at 19 gallons.

250 miles X 4% = 10 miles...... So that gives you 260 miles.

260 miles / 19 gallons = 13.68

Instead of: 250 miles / 19 gallons = 13.15

Little better. You also have to take into consideration the rolling resistance of the new tires + the weight difference + the fact that you have now numerically lowered your gear ratio. Around town bad ====== Interstate Good.

another thing after they play with what they call winter fuel you will lose fuel ecomny even if you don't do anything different. The combination change your ging to see a change in your fuel milage.
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