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  #1  
Old 09-03-2002, 10:32 PM
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For you Mathematicians

In order for me to get an accurate MPG reading, I would like to know by what factor would I have to multiply my milage in order to compensate for having the wrong size tires. I'm running 205/70/14's instead of 195/70/14's. I wonder if its even noticable? Thanks brainiacs!
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  #2  
Old 09-03-2002, 10:52 PM
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multiply by 1.022 for your conversion. You are covering 2% more ground per revolution than 195's would.
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  #3  
Old 09-03-2002, 11:45 PM
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The difference is the 205 is 14mm taller than the 195.
Aspect ratio of the tires sidewall percentage.
[ example - 205 -70- 14 has a sidewall measurement of 70% of
the tire width , 205 X .7
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  #4  
Old 09-04-2002, 12:25 AM
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Best way would be to check your odometer ison a measured highway for at least 100 miles. You can use any interstate or freeway that has mile markers. This would show any inaccuracy in your odometer.

I checked my 300SD this way for 400 miles and found the odometer to me accurate within 0.15 percent (15/100 of 1 percent) which is about as close as you can get after a tire size change from 195-80R14 to 205-70 R14.

P E H
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  #5  
Old 09-04-2002, 01:51 AM
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You can go here and check my math., but you'll find it very, very close to 102% for a "perfect" odometer. http://www.retread.org/packet/index.cfm/ID/187.htm
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  #6  
Old 09-04-2002, 01:53 AM
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another link:

http://www.miata.net/garage/tirecalc.html
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  #7  
Old 09-04-2002, 06:09 AM
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http://www.miata.net/garage/tirecalc.html
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  #8  
Old 09-04-2002, 07:06 PM
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Thanks guys, 1.022 sounds good to me, it equates to about 9 extra miles per tank full.
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