Corvette: Year by Year1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964
1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976
1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988
1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000
2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012
2013 2014 2015 2016 2017 2018 2019 2020
June / July 2012
All this time I had noticed that the speedometer seemed to be reading low. While driving with minimal traffic on the freeway at about the same speed as the other cars, the speedometer would read about 60 mph. It occurred to me that if the speedometer (and therefore the odometer) was low, my mpg reading might be similarly off.
iPhone to the Rescue!
I then tried the Speedometer app in the Corvette and was amazed to learn that while driving 70 mph, the speedometer indicated 58 mph!
The Odometer app reported a similar result. A trip of 113.88 miles was only 94 miles according to the odometer on Safari.
Some quick math revealed that adding 21% to either the speedometer or odometer reading would give me an accurate reading. This meant that instead of 12 mpg, I was actually getting around 14.5 mpg, about what I would expect from a small block equipped 1968 Corvette. BTW, I've updated the Show Me the Money page to indicate the true mpg.
I am thinking about having the speedometer recalibrated. The problem there is to keep everything consistent, I would have to update the entries I have so far in the mpg tracking database. We'll see.
Spare Tire Report
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