Some day when you are on a freeway without many other cars around, shift into neutral. Depending on your car model, you will lose 1-2 mph every second until you get to around 50 mph, when you will lose speed much more slowly. On a flat road it might take you a whole minute to drop the next 10 mph.
(Make sure you are in the right hand land before doing stuff like this. Also be aware that driving too slow can be as dangerous as driving too fast.)
I wonder if some wing tech were possible to be used on vehicle body as an aftermarket option to increase laminar flow (or delay separation, I'm not sure, not an AE) to reduce air resistance.
I've seen hypermilers put aeroshells (don't know the proper name) on the backs of their cars to reduce air friction. It's pretty simple to do, but it looks very trashy.
Some day when you are on a freeway without many other cars around, shift into neutral. Depending on your car model, you will lose 1-2 mph every second until you get to around 50 mph, when you will lose speed much more slowly. On a flat road it might take you a whole minute to drop the next 10 mph.
(Make sure you are in the right hand land before doing stuff like this. Also be aware that driving too slow can be as dangerous as driving too fast.)