7.8 mpg would only be reasonable if you were driving very aggressively (slamming the gas pedal to the floor all the time).
My car (bolt ons + tune, + 3200 stall converter) gets 14 mpg going back and forth to work (lots of stopping at red lights) with a heavy right foot.
If I drove conservatively, I could probably get 16 mpg in the city, but I didn't buy a Camaro SS to drive conservatively.
My car gets around 21-22 mpg on the highway doing 80 mph.
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