Two weeks ago, I swapped a used "i" exhaust with Superspring cat-back onto my eta, including a new oxygen sensor. I thought I had found the holy grail of economy mods, because when I filled up today the mileage (gallons put in divided by odometer reading) was 30.6 mpg for city driving--I'd been getting 17-19 on the same commute.
But then I watched while driving around and realized, based on maps and rough distances I already knew, that my odometer is suddenly reading 50-100% high (i.e., an indicated 5 miles is actually about 2.5-3). What could have caused this? Search didn't turn up anything similar except one guy who found that he had a refaced metric speedometer. I know that's not the case here--nothing changed except the new exhaust.
-Dave
But then I watched while driving around and realized, based on maps and rough distances I already knew, that my odometer is suddenly reading 50-100% high (i.e., an indicated 5 miles is actually about 2.5-3). What could have caused this? Search didn't turn up anything similar except one guy who found that he had a refaced metric speedometer. I know that's not the case here--nothing changed except the new exhaust.
-Dave
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