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Scott makes a good point. I had a 91 RS with the LO3 and got better MPG than my friends with 6 bangers. It does have a little more power, I think the rating difference between the 3.1 and the 5.0 TBI is about 25hp which isn't really much in a 3400+ lbs car. The LO3 auto's are also typically mantled with a peg leg 2.73(manual trans usually got 3.08's) rear so it is hardly a "hit it and hold on" kind of a ride.
With a handful of free/super cheap mods I could get close to 30mpg on straight highway trips.
-Tim
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