Quote Originally Posted by bfarroo View Post
.91 transfer gears are the way to go. Had them in my 89 spirit for years. Got a best of 32.5 mpg driving to sdac in detroit two times ago straight hwy at around 60. dropped to 27 or so at 70-80.
They are awesome. My NYer now gets 36mpg on the freeway at 70-75mph. The 2.5 with the .91 gears and a little tuning is the hot ticket.

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ETA: The best I could do was 27mpg at about 55mph with the 2.2 and stock gears.