Check out www.fueleconomy.gov for yearly information on all US cars fuel ratings. Any hybrid car (Honda Insight, Toyota Prius) will have excellent fuel ratings. Also, turbo diesel engines by VW do very well. Both the VW New Bug and the VW Golf models with TDI engines get 42/49 for the last few years.
Here are more opinions and answers from other s.com members:
Hybrids have been proven to get poorer fuel economy than diesels in "real world" operation, especially in the relatively flat interior of Australia. Petrol hybrids are "in their element" in the cut and thrust of city driving, not on the open road.
A car that runs on fuel cells only has a similar overall efficiency to a car that runs on petrol because a car that runs on fuel cells is designed to not pollute the Earth but you need renewable energy resources to generate the electricity which is like the efficiency of the petrol pollution. That was what I put on my homework anywayz. :)
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