Infiniti has managed to reach the automotive world’s equivalent of Nirvana with its latest 2011 M sport sedan by boosting power significantly while also managing to lower fuel consumption over the outgoing model. Additionally, the new model is also bigger, more luxurious and packed with tons of additional features.

Infiniti today released official EPA fuel economy estimates for the 2011 M range, showing increases of up to four mpg versus the 2010 model. The new generation M's all-new design includes two new powerplants, a 3.7-liter V-6 and 5.6-liter V-8, each offering more horsepower and torque than the previous smaller displacement designs.

The 2011 Infiniti M56 develops 420 horsepower and 417 pound-feet of torque, which is an impressive gain of 95 horsepower and 81 pound-feet over the outgoing M45. Fuel economy, meanwhile, is rated at 16 mpg in the city and 25 mpg on the highway--up 4 mpg on the M45’s highway figure. The all-wheel drive M56x gets a 2 mpg improvement over the previous version at 16 mpg in the city and 23 mpg on the highway.

As for the 2011 Infiniti M37, the V-6 rates in at 330 horsepower and 270 pound-feet of torque, which is about 27 horsepower and 8 pound-feet of torque better than the M45. Fuel economy for the M37, meanwhile, comes in at 18 mpg in the city and 26 mpg on the highway, while the M37x gets by on 17 mpg and 24 mpg respectively.

The all-new 2011 Infiniti M is scheduled to go on sale nationwide beginning March 18. Pricing starts at $46,250 for the rear-wheel drive M37 and tops out at $60,050 for the all-wheel drive M56x.