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The Top 10 most energy efficient vehicles over their lifetime:

1. Scion xB ($0.48 per mile)
2. Ford Escort (0.57 per mile)
3. Jeep Wrangler ($0.60 per mile)
4. Chevrolet Tracker ($0.69 per mile)
5. Toyota Echo ($0.70 per mile)
6. Saturn Ion ($0.71 per mile)
7. Hyundai Elantra ($0.72 per mile)
8. Dodge Neon ($0.73 per mile)
9. Toyota Corolla ($0.73 per mile)
10. Scion xA ($0.74 per mile)

The 10 least energy efficient vehicles over their lifetime:

1. Mercedes Benz produced Maybach ($11.58 per mile)
2. Volkswagen Phaeton ($11.21 per mile)
3. Rolls-Royce (full line average: $10.66 per mile)
4. Bentley (full line average: $10.56 per mile)
5. Audi allroad Quattro ($5.59 per mile)
6. Audi A8 ($4.96 per mile)
7. Audi A6 ($4.96 per mile)
8. Lexus LS430 ($4.73 per mile)
9. Porsche Carrera GT ($4.53 per mile)
10. Acura NSX ($4.45 per mile)

Hybrid energy efficiency over their lifetime:

1. Honda Insight ($2.94 per mile)
2. Ford Escape Hybrid ($3.18 per mile)
3. Honda Civic Hybrid ($3.24 per mile)
4. Toyota Prius ($3.25 per mile)
5. Honda Accord Hybrid ($3.30 per mile)