I paid $250 for my metro last summer, but had to put some work into it. I probably put another $100 into junkyard parts to get it like it is now. My 95 park ave was around $600 and got 30mpg while being fully loaded.

Back in 1965, my dad paid $235 for a '59 Anglia. We still have it even though we haven't driven it in years, and at 40 mpg, it's still the most fuel efficient car we've ever owned. I take that as sad commentary on the FE of the typical car of the 60's, 70's, 80's, and 90's. You'd think that with 40 years of advances, we ought to be able to blow away the FE of such an obsolete car. And perhaps you could argue that something like the Metro is a significant advance, but I wouldn't. It's just lots of little advances. The Anglia is to the Metro as a standard incandescent bulb is to a halogen. I'm looking for improvements in the fluorescent or LED league.

1988 ford festiva brand new for about $8200, including tax/plates.
average tank was around 45mpg. had quite a few over 50mpg hwy.
All that mpg and it had a Carburetor too!

way too much

$2500 for my '97 Saturn SL.

$2400 for my 1994 Civic DX Coupe with 125,000 miles at the time. Put 80,000 trouble free miles since, just turned 205,000 this past week. Averaging over 45 mpg now.

It was about $11K for a brand new '92 Corolla. I had it for 10 years and always got over 36 mpg/tank. That was before I discovered hypermiling. Now I'd probably be getting more like 45 - 50. Too bad the salty roads turned it into a coroda. ;)

$435+$75=$510 for two bunnies, but that will drop below $500 as I have some parting to do. Hoping to get lower, but I'll need patience for that. The pickup and Camry were free.

Yea me to. If you add the 2 cars together that I'm driving now. One which cost me nada, it still to much:)

Which do I choose? The poll says "most FE vehicle", the thread says "most fuel efficient car". If 'vehicle': My sailboat uses less 'fuel' per unit of distance than my bicycle.
And are you considering fuel efficiency based on one best measurement of distance per unit of fuel, or on the lifetime (or duration of ownership) average of all distances divided over total fuel? I've had cars that could be wrung out to a better mpg than the best of my motorcycles, but the cars were seldom driven that way. Their average was lower than the motorcycle's.