( Quoted from MotorTrend )
" Our RDX was no slouch even with the added drivetrain mass --- we likened it to the Evo of crossovers when we said goodbye. Acura's SH-AWD is impressive; through planetary gearsets and electromagnetic clutch packs, it's capable of overdriving the outside rear wheel to create yaw, which reduces understeer. The downside is the roughly 200 pounds it adds to the curb weight. Without it, the RDX's fuel economy rises 2 mpg, up to 19/24 city/highway. It's livelier on its MacPherson front and multilink rear suspension too. "
For more information, visit http://www.motortrend.com/roadtests/suvs/112_0908_2010_acura_rdx_review/index.html .