Rented two "Full Size" with the free upgrade to a premium recently in Virginia. One was a Dodge Challenger GT, other was a Chrysler 300S (both V6). Both were decently sized, and much bigger than the Taurus and other options. Can't speak for the Volvos and Avalon, but I'd take the Dodges if possible just due to the large size. Note the Challenger is 2 door so not quite equivalent in size to a Charger, but still a nice car if it's just one or two people riding. The V6 package offered decent power and got average 28 mpg on highway driving.