The 2010 Infiniti FX35 is available as a 4-door, 5-seat sport utility. Starting at $42,850, the 2010 Infiniti FX35 4x2 is powered by a 3.5L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 16-mpg in the city and 23-mpg on the highway. The top of the line 2010InfinitiFX35AWD , priced at $ 44,300 , is powered by a 3.5L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 16-mpg in the city and 21-mpg on the highway.