Welcome to the site Nathan.
Well, besides the usual car stuff, I'd be checking for obvious signs of past ricers (air filter, header, stick-on fake accessories). Generally ricers can barely change their own oil, which means the wiring has been hacked, bolts are stripped or broken off, parts are missing, and the car has probably been flogged to death. If it looks like it was riced, you're better off walking away.
For the test drive, see if you can feel the car go to lean-burn mode. Cruising around 55 once it warms up (a few miles), you should feel a slight "stumble", then a significant loss of power provided you don't romp on the gas. If that's not happening you won't get the VX mpg's, and who knows whats wrong. My car had a couple bad motor mounts, take a look under the hood at both driver's side mounts to check for rips in the rubber. Anyone else have ideas?
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