I've had both extremes... Zetec/ATX to SVT. Both cars got about the same mileage, with the SVT netting more on the highway (80-85mph). I'm usually getting 22-24mpg city and 26-30 highway.

The lowest I've ever seen was with my Zetec down in Texas with +110�°F and who-knows-how-old spark plugs/wires. Was about 18mpg.

Goin' Round Traffic Circles @ 50Km/h!!! \m/ -- 1998 E0 SVT #2119 of 6535 \m/ -- 2003 Sentra SE-R Spec V