The 2008 Dodge Nitro is available as a 4-door, 5-seat sport utility. Starting at $23,660, the 2008 Dodge Nitro SLT/RT 4x2 is powered by a 3.7L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 16-mpg in the city and 22-mpg on the highway. The top of the line 2008DodgeNitroSXT 4x4 , priced at $ 21,980 , is powered by a 3.7L , 6 - cylinder engine mated to a manual transmission that returns an EPA estimated 16-mpg in the city and 22-mpg on the highway.