2011 Yamaha TMAX, The TMAX has more than enough power to run with freeway traffic, and its aerodynamic fairing and expansive cockpit !MAXIMUM POWER. MAXIMUM STYLE. A fuel-injected 499 cubic centimeter parallel-twin engine, a lightweight aluminum frame and radial tires on 15-inch wheels mean this scooter goes like a sportbike. The TMAX has more than enough power to run with freeway traffic, and its aerodynamic fairing and expansive cockpit will get you on there in maximum comfort and style151returning 47 miles or more per gallon (estimated) on average the whole way. Available from February 2011