The low 1st gear of the 700r4 would actually be an advantage. It would allow slightly taller rear gears to keep highway RPM low, and still give a good launch from a stop when desired.
If the engine can make its torque low enough, I would see no problem with turning around 1600 rpm @ 60 mph. My Jeep turns about 1800 @ 60 mph, and it's geared a little low IMO, considering it'll pull comfortably in OD with the TC locked from about 1050 rpm, even when climbing a hill. By 1200, it pulls pretty darn well.
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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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