I'd like a spartan car with manual windows, basic seats, no aircon and very limited safety equipment
But with a modern econoboost engine. Not built for power or speed, but to see whether you can get 100mpg out of it.

A ropey 1.6D Ford Escort from 1986 used to get 71mpg. Surely with a modern motor that car could go on forever.
( Grrrmachine the indifference engine, Mon 20 Jul 2015, 8:51, 2 replies)

Feasible to build your own?

( drimble he'd been white, he'd been black, Mon 20 Jul 2015, 8:58, closed)

Physically possible, but not economically viable.
You'd probably have to transfer the entire vehicle wiring from the donor car (a newish Fiesta?) to the old car as well as fabricate a complete exhaust system. Lots of work. You'd be better off just trying to remove 240kg from the Fiesta.
( Grrrmachine the indifference engine, Mon 20 Jul 2015, 9:04, closed)

Take out the engine and you're halfway there!

( Peej, Mon 20 Jul 2015, 9:12, closed)

Tuning diesels for max economy
will cause them to pump out NOx like crazy.
( willenium Fist bump for verification, Mon 20 Jul 2015, 12:21, closed)

Which is bad news
Since the psychoactive substances bill made them illegal
( Greenbat, Tue 21 Jul 2015, 0:11, closed)