Dandy Benefits: GasDandy can manage up to three separate vehicles at one time and record the following for each vehicle: -Records Gas Mileage -Odometer Readings -Fuel Purchase Dates -Oil Changes -Tire Rotations -Business Mileage View Vehicle Trends with Graphs With GasDandy? Notes you can record any data you wish to keep for future reference. Such data could include spark plugs air filter changes, wipers, repair records, etc.