The answer depends on the size of the rider and the type of riding he or she does. For example, a 100 pound woman who cruises at 45mph on rural Iowa backroads will get better mileage than a 250 pound guy who battles rush hour traffic in San Francisco. That said, we see riders of all shapes and sizes riding in all sorts of different places getting an HONEST 80+ miles per gallon on a Buddy 125. Some Buddy 125 riders have achieved over 100mpg! Figure that a 50cc model will get 5-10 mpg higher than that. Figure a 150cc model will get 1-3 mpg lower.