My car gets over 50 mpg and that's from odometer and fuel volume, not from a spec sheet. Diesel goes a bit further than petrol on a volume basis but not that m

My car gets over 50 mpg and that's from odometer and fuel volume, not from a spec sheet. Diesel goes a bit further than petrol on a volume basis but not that much. Maybe it's just due to smaller US gallons and a cruisy commute. A colleague of mine gets 65 mpg, fwiw, and it's not a hybrid. Also the emissions thing wasn't about fuel economy, but about NOx emissions.