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under recording of mileage (Read 56 times)
springman
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under recording of mileage
05/28/19 at 10:11:36
 
I was not particularly happy with what my mpg calculations were indicating and so remembering what Dave had mentioned about an approximately 10% discrepancy of speedometer/odometer based on a kawi front pulley and the 140/90-15 rear tire, I decided to verify this discrepancy. I just finished my second comparison of odometer vs. gps tracker and have confirmed that the discrepancy (under recording) is actually just over 13%. Just a fun fact for the day! Cool
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06 S40 seat mod, airhawk, HD muffler, Shinko 712 140-90-15 rear tire, Shinko 230 front tire, versy cam chain tensioner, Rotella oil, Volar brake pads, EBC clutch & springs
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jcstokes
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Re: under recording of mileage
Reply #1 - 05/28/19 at 13:01:00
 
So at 60 mph indicated you would be doing around 69 mph?
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Completely stock 2010 S40, aftermarket rev counter and back pack, Airhawk seat pad
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springman
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Re: under recording of mileage
Reply #2 - 05/28/19 at 13:50:04
 
Yep, about 68 mph. At indicated 70 I am actually doing 79 mph. I am assuming this would hold true for all other savages/S40s that are modified in this way.
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06 S40 seat mod, airhawk, HD muffler, Shinko 712 140-90-15 rear tire, Shinko 230 front tire, versy cam chain tensioner, Rotella oil, Volar brake pads, EBC clutch & springs
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batman
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Re: under recording of mileage
Reply #3 - 05/28/19 at 22:34:14
 
But it constantly changes as your tire wears.
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MMRanch
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Re: under recording of mileage
Reply #4 - 05/29/19 at 22:22:30
 
So when I'm getting 50 mpg , really I'm getting about 56 mpg.   That's about where the numbers usually fall.

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springman
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Re: under recording of mileage
Reply #5 - 05/30/19 at 12:05:46
 
You're right MM. I guess I am getting pretty good mpg. Smiley
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06 S40 seat mod, airhawk, HD muffler, Shinko 712 140-90-15 rear tire, Shinko 230 front tire, versy cam chain tensioner, Rotella oil, Volar brake pads, EBC clutch & springs
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