A "new" transmission (with a fix so it will never develop the grind) from Scott over at IC is ~$800, and I can't see it costing more than $3-400 to have installed. The transmission is light enough you could literally do it with the car on jackstands, unaided, from underneath, in a few hours.
A G1 Insight hypermiled is easily good for 80-100mpg in the conditions you'd get 60 out of a Mirage. Some have even had 120+ out of these cars over entire tanks.
That said, if you're the only one of your friends who can get access to a 4+ seater, it's important that you haul around more than one other person with some regularity, and the cost of a new vehicle plus increased operating costs aren't that big of a consideration, I'd say go for it. A car that can't do what you need it to is a lousy car to own, regardless of what other virtues it may possess.
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