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The best possible thing you could do is to rip out the gear you want larger and find a custom one. . .thats expensive and laborious. Trans swap with a relatively new trans will always be expensive. Swapping out a civic trans from 92-96 is cheap because they are plentiful. Your XFE trans not so much. In your case if you are doing it yourself it honestly might be cheaper to pop the trans apart and find something really enormous to fit in there.
New trans on a new car will run about a grand or more. New gear could be as little as 50 bucks. . .but instead of a 1-2 day thing its a saturday sunday all day, monday night, tuesday night and wednesday night to get it back in the car.
If you're not doing the labor this is not worth it at all.
Even if gas costs 8 a gallon it takes forever to recoupe the 2K its going to cost in gas. . .
If you aren't doing it yourself and if its over 500 bucks you are far better off just ripping extra weight out of the car. . .Spare seats, insulation AC lines, veins compressor, manufacturing your own fiberglass shell(including the hours spent learning and screwing up several copies). . . You might get 10 mpg extra on a huge gain of mpg, which I doubt. It would take forever to pay that down even with an extra 10 mpg. . .
If you think its going to get that bad take all the trunk lining stuff out, the spare tire, the metal frame for the trunk and put in strong mesh netting and coat the underside in a big gortex bag, take the carpet out, dash, door panels, speakers, fans, glove box.
Doing all of that would get close to giving you the same mpg increase and its less than 100 bucks for water proof fabric and mesh netting for strength. . .
Lighter wheels and tires when you have to switch and losing as much weight as you possibly can are also cheaper than paying a mechanic to do this, trust me I work in a shop lol.
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