[Fat Charlie]

Something cheap and underpowered, with as low a first gear as possible. Focus on cheap and underpowered, though.

Your best bet is an almost insultingly simple classroom instruction on "How Disc Brakes Work." Explain how the spinning rotor and the non-spinning pads are gently pressed together until their speeds match. Explain that locking them up and riding them for miles are both bad. Then move on to "Part II: How A Clutch Works" and give the same explanation with the part names changed.

The first stage of driving should be done in their cars and should focus on their use of the brake- rolling aound the lot at idle and stopping. Once they can focus on doing what they need to do while minimizing wear in a car they (hopefully) respect, they can get in your M/T and work on starting up and getting into second. This isn't a road car or a road class, so don't worry about that.

A car for teaching hypermiling doesn't have to be a Metro. I don't think a Metro is even a good car for that because the car does so well on its own. You want to teach them to outperform the car, not drop them into a high performing car and wow them with its numbers.