I'm not really doing anything special as far as I know. I'm usually running the ac on the max setting all the time, and the best gas you can usually get around here is only 91 octane.
I've only had the car for about 14k miles now and I've changed the air filter once, and had the oil done at the dealer every 3-4k.
I drive fairly hard through second and third, usually shifting at 4-5k rpm. I think 20.7 mpg was the worst I did since I started keeping track in mid july and I drove that tank really hard and less highway than usual. I do drive mostly highway miles since each way to work is 20 miles, almost all highway.
One thing I started doing was shifting really early into 5th, usually if I'm crusing at anything over 40mph. I think this saves gas and there is still enough power there for me at this speed.
The other thing I would wonder about is does the returnless fuel system on the 2000's make any difference in mpg vs. the older fuel system?
Hope this gives you some ideas. 18mpg sounds really low to me even for a SVT. Do you have any mods that might be causing it to use more gas? Remember more air flow = more fuel flow. You'd probably want to check with other SVT owners as to what they get before you start to worry though. (I remember a thread about this but it may have been on the old boards)
-CtrAltDel
