I just ran across something cool on the MX-5 Miata Forums. Miata owner "fujioko" swapped a 1.0L I3 Geo Metro engine into his or her Miata. The build thread is here:
Suzuki G10 3 cylinder project. - MX-5 Miata Forum
Jump to page 8 or 9 of the thread to see the current status of the car. It looks like the three-cylinder Miata is currently getting ~50mpg.
Suzuki G10 3 cylinder project. - Page 8 - MX-5 Miata Forum
Pics & Videos ...
$500 "Rusty" 1990 Miata host vehicle
1996 Geo metro 1.0L engine with 1986 Suzuki Samurai gearbox ("The drivetrain saves about 200 lbs. vs. Miata drivetrain)
Of course, things don't always line up...
Custom shift mechanism
