The M45 featured a 4.5-liter V8 listed as 335 hp in its first year, but 325 hp thereafter due to a change in the way horsepower was measured (actual output did not change). Used Infiniti M Models The last, fourth-generation Infiniti M was produced from 2011 through 2013. Nothing wrong with the Lexus and it was a great car, but the Infinity has a much tighter feel, better performance, better infotainment and better sound system. It is covered in a separate review. Its fuel economy is rated at 17/25 mpg, down from previous years. Subject to approved buyer credit. High-intensity discharge lamps are now standard, as are climate-controlled seats and new instrument panel lighting. The 2009 M35s and M45s differ little from each other "aside from the badging," says Cars.com. I do hope there will be a software upgrade that makes this car perform in a more consistent manner. Body roll remains well in check, and at its limits the M displays good grip and even better balance.". The 2010 Infiniti M is especially comfortable for long-distance highway hauls, with plenty of space in front for adult passengers and lush fittings facing them from every angle.

For shoppers who like the car's combination of stealthy speed and luxury, and don't need a lot in the way of interior room, the first-generation Infiniti M45 could be a good match.

I'd consider myself an enthusiast-level driver and appreciate the go-fast bits. The Infiniti M35 and M45 models are virtually identical in appearance. Option highlights for all M sedans included a power rear sunshade, an air purifier, upgraded leather upholstery, a 16-speaker Bose audio system, adaptive cruise control and numerous electronic accident avoidance systems. "A warm, upscale ambiance" is how ConsumerGuide describes the Infiniti M's cabin. Before this car I was a proud owner of a M35h which I absolutely loved but it just was sporty enough. It's a perfect blend of reliability, performance and luxury. I also considered an M56xS, Q50 S AWD, FX37, Audi A6, Jaguar XF 3.0 AWD, and Chrysler 300 SRT8. Should you be interested in finding one, keep in mind that changes were relatively minor, with 2008 being the only year of significant non-engine alterations. Edmunds calls the 2010 Infiniti M's powertrains "impressive" and proclaims, "the M35's V6 should provide more than enough power for most drivers." ConsumerGuide notes, "A 50/50 front/rear power split can be locked in via the snow-mode button on the center console." Kelley Blue Book points out "a pull-down center armrest [in the rear] conceals a modest pass-through opening to the M's 14.9 cubic-foot trunk.". In reviews read by TheCarConnection.com, this sentiment is a common theme.