2011 Toyota Sienna Unveiled Minivan accommodate a 3.5-liter V6 DOHC agent authoritative 266 hp at 6,200 rpm and accepted to bear ammunition ability of 18 mpg for city/ 24 mpg for highway. Also offered is a 2.7-liter V6 DOHC agent authoritative 187 hp at 5,800 rpm and the accepted ammunition ability stands at 19 mpg for city/ 26 mpg for highway.