I have been there a few times. You can do this with any car(in the past) but if you want to engine brake down a large grade it better be fuel injected. Engine braking with a carburetor is gonna blow your exhaust up as soon as you turn the ignition on. Also engine braking will retain your power brakes whether they are vacuum or hydraulic. Most new cars are so faggoty you can't even do any of this. I've rolled into gas stations before after running out of gas. Pretty awesome feeling of relief. This was all moreso when I was younger and broke, only buying gas as needed.