Or maybe an Audi S5. Or a new 535i.

The 550i (2007), although a blast to drive, is really a gas hog.

How is the M on gas?

Also, will it compare in driving dynamics to the BMW?

 

If you're main concern is Gas try out the M35h 4 cylinder gas mileage with V8 performance in a sedan. spice it up with the Aerodynamics package. If your'e more inclined to driving dynamics, get the M37 sport. Infiniti does BMW better than BMW nowadays.

 

i pulled on a 550i... pulled on a S5 ..... having fun w/ my M37S...... highway im getting 28mpg vs the 32mpg for the M35 hybrid