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Oh if your peak torque is at 2750 then I guess the smaller tires aren't really that bad. With my car my peak torque is about 2200-2500, so I try to make sure that my RPM at 65 mph is close to there, since I do mostly highway driving.
Not using the wider MT tires is a good choice--especially given that you do not have 4wd at the moment. RWD is definitely a pain in the snow.
February or March sounds reasonable to get something done--I would definitely underestimate what could be done so I'm not stuck with a half done project at the end. It sounds like if you just fix your brake line, you would be able to have the other truck out in time and have your Explorer driveable again. Personally I would be nervous to drive it if one of the shackles is cracked.
I distinctly remember a thread on a different forum where a guy (now passed away) was somehow able to get 30 mpg on his Ford Explorer. If you're interested at all, I probably could find it again.
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