Well, first off, how far did you drive!? Obviousy, if you drove 75 miles this would be normal, but we can guage how bad it is.
Second, How much fuel was previously in the tank? This will make a huge difference. When I have a full, and I mean full, tank, my fuel guage barely moves. But as soon as I have less than 3/4 of a tank, down she goes! Weird, I know!
Third, How far did you drive 90-100mph? Anything above 75, and this car drinks gas like a fish. 60-70mph is optimal. Use the Driver Information Center's Instant Fuel function, that'll probably show scary numbers at 100 mph!
If you are doing a lot of WOT runs, kiss your gas goodbye. Supercharger + Heavy Foot = empty tank!!
