Check out this 200 mpg NR-1 car from Niama-Reisser. This is its suspension.
The engine is even cooler we showed it awhile back here is the link. We'll show you a rendering of a 7 liter NR engine in the March issue. Plus 10 other amazing companies.
Here is a link to the Niama-Reisser pistons.
Niama-Reisser