One of my dad's friends has a 91 850i automatic. Around town, the gas mileage is as bad as, or slightly worse than what I get in the Jeep (the BMW is about 100 pounds heavier than the Jeep, with a 5.0 liter V12). It's rated for 20 on the highway, IIRC.
For high-speed running, RWD would be a benefit. It's less prone to understeer in fast corners, as you're not over-working the front tires. Plus, the weight balance is better, which helps too.
A Lexus GS300 is RWD, and would probably do decently.
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Call me crazy, but I actually try for mpg with this Jeep:
Typical driving: Back in Rochester for school, driving is 60 - 70% city
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