If a sport utility with a conventional engine gets 15 miles a gallon, it needs 40 gallons for a 600-mile trip.

E85 cannot be used in a conventional, gasoline-only engine.

Its conventional engines are fueled by liquid oxygen and hydrogen.

It is designed to generate more power in less space than conventional engines.

A conventional engine was never there in the first place.

The main difference was that the Audi used a conventional four-stroke engine.

As a result of fewer components, more easily manufactured than conventional engines.

Able to fire on a leaner mixture than conventional engines.

It was compact, light and very free reving in comparison with conventional engines of the time.

This causes the pistons to spend more time at top dead center than conventional engines.