If you create an inefficient internal combustion engine, you'd know because you have to go to the gas station every 5 miles. In this case it would be like someo

If you create an inefficient internal combustion engine, you'd know because you have to go to the gas station every 5 miles. In this case it would be like someone was filling up the the gas without you knowing, and then a few weeks later you get the bill, and then you realize that your engine is inefficient.