The phrase "decent mileage" means that something, such as a vehicle or appliance, can travel or function for a good distance or amount of time without needing to be refueled or repaired.
Sentences with «decent mileage»
Most of us need to manage limited resources and want to get decent mileage out of our money. (rogersinsurance.ca)
The best thing about the vehicle was that it gets decent mileage for its size, and it looks very nice inside. (autolist.com)
The gearbox is rough, but it does deliver decent mileage. (topspeed.com)