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The 02 fix will get him just with conservative driving(slow accel and light DWB/DWL, with very little engine on coasting and very little route optimization) will get him to around 30-35 the trans will net him about 3-5 mpg depending where he spends his time. Between O2(if thats the problem, it sounds likely if its not that its a rusted out section of exhaust) and trans he will net a total improvement of 10 mpg, which is about right.
I went from 25-35 by replacing exhaust piping with non-falling apart assembly, getting much lighter wheels and tires(14s) and driving conservatively. My wheels are lighter I'm pretty sure as his look stock and mine are after market alloys, but that trans swap will make a huge difference. It ought to be more fun to drive too. The Del Sol overpowers its 1st and 2nd and is just about right for 3rd just a scratch short and then its terribly short in 4rth and 5th.
With a trans taller all the way through you own't have to shift so quickly if you want to go fast(it really does hurt you, I've had it supercharged and I had to start in second or it was stutter step 1st-2nd).
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