We love interesting concept cars here at Gas2.org. We especially love concepts that go outside the box to figure out ways to improve fuel efficiency.
Valentin Technologies is hard at work coming up with a 5-passenger sedan that accelerates from 0-60 mph in 4 seconds, and can go over 1,000 miles on just 6 gallons of gas. They can do this, they claim, through a unique hybrid gas/hydraulic engine system and a an extremely light weight of about 1,600 pounds. But is it just vaporware?