Well I think it is because bikes go much further than cars on gas, and as you know almost all bikes have a reserve. Most people just watch their mileage and know when it is time to get gas. Others wait until they need to flip their petcock to reserve, and lastly, people like me check how much gas they have often enough to never really worry about it. On a side note, some newer bikes have gas guages, but it is usually the more expensive ones.BradPeart said:I know that it's standard for a bike to not have a gas gauge, but why is that? Why don't they just have one? They make all cars with gas gauges.