The Quest lags nearly all its competition, when it comes to fuel economy.
The 2011 Quest is rated at 18/24 mpg in all versions. That ties it with the Toyota Sienna for the lowest highway fuel economy numbers of any front-drive, V-6-powered minivan (the Sienna with all-wheel drive drops even lower, to 16/22 mpg).
The Chrysler Town & Country and Dodge Grand Caravan have lower city numbers, but earn an EPA-rated 17/25 mpg overall.
The Quest is not offered with any alternative powertrains, such as a hybrid or a diesel.