why do I get only average 13 mpg on 2001 Corvette C5?

jokajem

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I bought it two weeks ago and still driving it on the first tank. I use instant mpg to see how I drive. It is a 6-speed btw. It gets about 5 mpg in city and 21 or 22 in freeway. it has 42k miles on it and I drive very careful (no heavy foot)...I checked tire pressures, oil and evreything and everybody is getting 20 to 21 mpg overall where as I am getting 13 mpg overall.
I m gonna do it manually, I just filled up the tank, however does anybody own a C5 and if so, what's NORMAL mpg? I am using it as Daily Driver BTW!
 
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