I'm trying to read some data from my Prius CANBUS. Using a CANbus datalogger and Attila Vass documentation, I already managed to read data such as battery voltage, vehicle speed,... I'm now trying to acquire the Prius fuel economy (MPG) from CAN data. After a quick search on this forum and on Google, I'm quite confused. I learned that the MPG displayed on the Prius MFD is not directly available on the CANBus and that it should be calculated. I was not able to find a formula for the MPG calculation. A way to do this seems to be by using the Fuel injection information on the CANbus (Attila Vass excel file) and the vehicle speed. Other references speak about using the gas gauge information and the travelled distance. Softwares like CanView already give the car MPG so it should be possible to calculate it. Does anyone have information to share with me? Thank you for your help, Nik
I would recommend: mass_air_flow / 14.7 -> fuel grams/sec speed * K(1) -> speed in miles/second fuel_grams/sec / K(2) -> fuel in gallons/sec speed in miles per second / fuel in gallons/sec -> miles/gallon The constants K(1) and K(2) are left as a simple Google search effort. GOOD LUCK! Bob Wilson
