why do some smaller engines have lower gas mileage than some larger engines?

Question

why do some smaller engines have lower gas mileage than some larger engines?

In: 208

Answer 1

Inside an engine, there’s a mixture of fuel and air burning. The heat of this fire is what makes the engine run. The hotter the fire burns, the more power the engine will have. Now, with large engines, it’s pretty easy to keep the heat contained. This is just the same when cooking: a large pot will cool down much more slowly than a small one. In a small engine, you’re burning a lot of fuel just to have the temperature right. It’s more a heater than an engine.

This is very obvious in model aircraft engines. You can hold those in your hand. When you do the math, you’ll notice that they’re very inefficient. They’re burning lots of fuel for a little flying.