Volcanic rocks often have a vesicular texture caused by voids left by volatiles trapped in the molten lava. Pumice is a highly vesicular rock produced in explosive volcanic eruptions.
The Dodge Nitro is available as a sport utility. Inventory prices for the 2011 Nitro range from $6,585 to $16,609. It gets EPA-estimated 18-19 MPG combined.
MSRP: $19,990 / Average Price Paid $17,368. Horsepower: 283/ Horsepower-to-Dollar Rank: 0.0163. The number-one car on the list is not the one with the highest horsepower, but it is the most inexpensive of the highly affordable options. Those two factors combine to give the Dodge Avenger the best horsepower-to-dollar rank of 0.0163.