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masraum masraum is online now
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Join Date: Oct 2001
Location: Houston, TX
Posts: 32,657
you're speedo is probably off by 4-8 mph at 80. Almost all (all cars) speedos are off, usually reading a tad high. The best way to tell for sure would be to use a GPS or a radar/laser gun. You could probably use mile markers. Maybe test against 4 or 5 and use a stopwatch.

245 45 16 are a tad shorter than the stock 225 50 16, but only about 2%.
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'08 Boxster RS60 Spyder #0099/1960
- never named a car before, but this is Charlotte.
'88 targa SOLD 2004 - gone but not forgotten
Old 02-01-2004, 11:59 AM
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