Question

Notta fishent is out driving with her friends. her car engine needs a tune-up, and is running poorly. Usually she gets 18.5 miles per gallon (mph), but while the engine is running poorly, she only gets 14.5 mpg. How many kWh does it take to drive her car one miles while the engine is running poorly?

Compute the efficiency of her poorly running engine compared to her normally running engine. (this is not a defined use of efficiency, but it can still be calculated.)