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heh an e30 fan!
your eta (2.7 lump) can easily be modded to make good bhp and torque-making it more drivable and less stressed.
do you have those 'diving board' bumpers? They are heavy and even less aerodymamic than the european ones.
I'd advise switching to a manual trans to maximise mpg as you should already have a very long diff at the back.
As for the undertray, assuming the mounting threads are still on the car you could probably fashion a more effective one easily.
Fairly common to see 40mpg uk from 2.7 manuals being driven 'enthusiastically' over here.
Best of luck:-)
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