Although there are some similarities, these two are different in most aspects such as body structure, starting price, horsepower, fuel economy, and maximum occupancy. First of all, despite the fact that the 2017 GMC Savana is a Van and the 2017 Toyota Tundra Double Cab is a Pickup, there is no major difference in exterior dimensions. Also, the 2017 Tundra Double Cab is priced $3,020 lower compared to the base MSRP of the 2017 Savana. In addition, the Tundra Double Cab has a more powerful engine than the Savana, but it gets 3 more miles on a gallon of fuel. And finally, there is a difference in the number of passengers; the GMC Savana seats two more the Toyota Tundra Double Cab. Among similarities is the ground shadow size.