Market debut of new platform set to also underpin Q6 Sportback, A6 sedan Audi SQ6 E-Tron does 0-60 mph in 4.1 seconds, from 509-hp dual-motor system Gets an EPA-rated 275 miles in SQ6 E-Tron, up to 321 miles for base Q6 E-Tron Audi has always leaned into performance. Its vehicles have always been at their best with the magic that a little bit of…