GM for 2015 still builds an equivalent of the extended cab, but it is now called Double Cab. It has 4 doors, but the same wheelbase and overall length as the pre-2015 EC. The crew cab is 10 inches longer than the EC or DC. I don't know about fuel tank size for the new 2015s, but on older GM trucks, the EC only has a 26 gal. tank while the CC is 36 or 39 gal. And if you want to install a larger aftermarket underbed tank, they are no longer offered for the ECs, just CCs. Since the crew cab just fits in my garage, decision was simple.