Of course you should care.
To give you an idea, I get about 12-15mph in town. I get 20-22 on the freeway and I drive with a heavy foot and over 80mph most of the time. So I wouldnt worry.
Skyler
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2001 BMW M3 6spd
12.79@108
RIP
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1993 Notch w/ 98 4V 4.6 Fasttt...
-1989 Saleen Mustang #406-
12.32@109
-1999 Black Cobra Coupe-
JBA Shorties, Bassani Cat-X, Magnaflow 3", Pulleys, 85mm Pro-M, Ported Intake, Soild Rear w/ 4.30s, Tubular Front End, X2C arms, 13lb batt, few others.
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