Who likes jokes?
I do have one in stock.
Here it is:
Yesterday i was at the petrol station, standing in front of the pump,
asking myself which fuel my car needs,
leaded, unleaded, gas, biogas, diesel, biodiesel,
85 octane, 90 octane, 95 octane, or even higher.
Then I realized, I was not there with my car, but by bicycle.