The 2012 Infiniti G25 is available as a 4-door, 5-seat sedan. Starting at $33,100, the 2012 Infiniti G25 Base is powered by a 2.5L, 6-cylinder engine mated to an automatic transmission that returns an EPA estimated 20-mpg in the city and 29-mpg on the highway. The top of the line 2012 Infiniti G25 Journey, priced at $34,500, is powered by a 2.5L, 6-cylinder engine mated to an automatic transmission that returns an EPA estimated 20-mpg in the city and 29-mpg on the highway.