Cylinder shut off

[SamSheepDoq]

Maybe the idea of doing what GM did where half the cylinders can be killed when the car is at cruising speeds. Also, the ability to add a gyroscope that can tell the car to turn off when going down a hill to save gas (also what GM did). I can probably find more later, but this'll do for now.

[Daffyflyer]

Maybe eventually, but the last thing we need right now is MORE choices in the engine designer

[SamSheepDoq]

Sounds great! I'm not expecting it anytime soon, just a nice finishing touch type of idea.

[GavinMcStine]

I think GM also added an air pump to the exaust for a jeep or suv to lower emissions.