I do ONLY highway driving, and lots of it. I get right around 25 mpg -- I set my trip odometer when I fill up and I usually get to 400 miles before I start to sweat. Of course, I haven't let svx files mod her at all -- she's stock except for the thermostat.
When svxfiles and I picked up our last (4th) SXV in Florida, we had to baby her (bad MAF sensor, we found out later) so we kept her to between 65-75 mph. On one stretch, we got 475 miles on one tank! (Okay, so we like to live dangerously.)
I don't know how svxfiles' mileage is, you'd have to ask him, but I'm sure it's considerably lower than mine.
Diana
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