Why are there different types of gas?

Question

like unleaded, and deisel...why can't cars run on just one type of gas? what is the difference between the two?

Answer 1

Diesel engines use compression to ignite the fuel air mixture.  Gasoline engines use spark plugs.

Both engine types have pros and cons to them.

Answer 2

Two different engine types:

Diesel only works in a diesel engine, which has no spark plug (it uses pressure to combust the fuel).

Unleaded gasoline needs an engine with spark plugs.

Diesel engines are more efficient, but noisier.

Answer 3

Because diesel were cheaper long time ago.  But gasoline engines were easier to start and use during the winter.

So they all have advantages and disadvantages.

Good Luck....

Answer 4

Because of different octanes, diesel fuel being the lowest,Then you have 87, 93, 98. just  4 different ways to steal your hard earned money.