Good info DD, Im thinking if the b210 got 50mpg then the b110 with EFI
and some other mods for improved engine efficiency could be hard to beat.
An old goat I met at an gov. info session for fuel efficiency technology
grants has some crazy looking Renault 15 with with jet proof coated internals, exhaust system fueled by an LPG with small turbo.
It has the supposedly hemi style heads with crazy swirl style inlet ports
based on the Datsun design using very tricky welding and grinding.
Crank and most reciprocating parts are lightened.
He is a self employed mechanical engineer trying to get a grant for his
version of pre-compressed charge combustion process or something similar
and his wife drives an old bi0-diesel powered merc.
My ears propped up when I heard him speaking about the engine at tea break
after the information session. There are some wacky but wonderful people out there.