What sorts of vehicles do you folks think we'll be seeing in Part four?
Obviously we'll have something fast, noisy & exciting for whatever chase scenes, but what other cars will there be?
Animal powered wagons?
This would make sense if the climate shifts back towards "Normal" and the vegitation makes a comeback. Engines that Fuel themselves and have No Emmission Controls.

How about sail powered Land Yachts?
If fuel is pretty scarce this would make a lot of sense and is what I'd do for transportation provided I didn't have to be on the run from powered vehicles.
(And of course if the terrain was flat enough and it was windy enough)
If plant life was abundant enough, Ethanol for fuel could be a possibility.. Far better fuel than Methane, anyway.
If water wasn't a problem, Hydrogen could be a possibility.. Wind generators cracking H2 from 02..
Just throwing out some ideas..
Wat do ya think?