In terms of fuel economy,1 you'll find that the Volvo XC60 and the Volvo XC90 are nearly identical as well. When fitted with the T5 engine and FWD, the Volvo XC60 gets an estimated EPA rated 22 City/29 Hwy MPG while the Volvo XC90 achieves an EPA estimated 21 City/30 Hwy MPG.