Fuel Economy Methods: Part One
How do you calculate fuel economy? I read so many different claims about fuel economy, and I keep coming back to wondering how people arrive at their data. For instance, on the diesel forums it is not uncommon to see someone claim 24 MPG in a diesel pickup. And yet I have personally driven a Duramax LLY with a heavy load up a grade, and watching the digital mileage indicator, I have seen instantaneous readings as low as 3 MPG. That’s a huge swing.