Price: $17,995 - $22,675
Improvement: 6 mpg
Credit: $4,500
Annual fuel saved: 204 gallons
For those with big families in which third-row seats are occupied every day, a full-sized minivan is probably a must. If you can do with less space, the Mazda5 offers most of a minivan's benefits, including genuinely usable, if not luxurious, back-back seats. Plus, it's much more fun to drive than a big van.NEXT: GMC Acadia for GMC Yukon