 Tire size and gas mileage |
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| Ctrout |
 Feb 28 2005, 08:13 PM
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Member  Group: Members Posts: 377 Joined: 20-May 04 From: Mountain Home, ID. Member No.: 2,091  |
What does the common practice of going to a smaller tire size do to the overall gas mileage? I'm considering going to the original stock size tires for comfort (I don't race and may possibly increase my commute from 30 miles to over 100 mileas a day, round trip) and was wondering if I'll get noticeably better or worse mileage. If worse, I certainly won't bother.
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| Porsche Rescue |
Feb 28 2005, 09:26 PM
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Saving and Enjoying Old Porsches Group: Members Posts: 2,978 Joined: 31-December 02 From: Bend, Oregon Member No.: 64 Region Association: None |
I am doing the same with my car. I have found that 195/65 x 15 is the best choice in a modern size. Many brands make that size and it is very close to the diameter of the original 165x15, which is made by very few manufacturers now. You get 30mm more width, a lower profile and 195's don't require any adjustments to the rear fender arches. 195/65's have an overall diameter of about 25", stock 165 is about 25.5. The 195/50's that are commonly used are 22.7" or so. Makes the car lower geared, higher rpm for a given highway speed, and therefore fewer mpg.
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Posts in this topic
Ctrout Tire size and gas mileage Feb 28 2005, 08:13 PM
r_towle Larger diameter tire = better mpg.
Think about it... Feb 28 2005, 08:23 PM redshift Oh yes, moving back to stock will make you some ni... Feb 28 2005, 08:30 PM Ctrout
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I don't feel like I know you well e... Feb 28 2005, 08:39 PM MattR Wait. Now if you're driving on the surface st... Feb 28 2005, 08:42 PM redshift http://www.914world.com/bbs2/... Feb 28 2005, 08:44 PM Ctrout My current commute is about 10 miles "city" 20 mil... Feb 28 2005, 09:32 PM Porsche Rescue If you have some room between the tire and the fen... Feb 28 2005, 09:43 PM Ctrout Tires I have now are nearly new. Probably not wor... Feb 28 2005, 09:53 PM
nebreitling what kind of mileage are you getting now? hopefu... Feb 28 2005, 10:27 PM |
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