The only accurate way to measure and compare your fuel consumption is in MPG (divide your miles by your gallons, which means filling to the first click every time and resetting your trip computer to keep track.) My best tank to date (which will probably be bested again by this one) was 563mi at the flickering low fuel light, running through ~13.6 gallons. That could have been a 600+mi tank just as easily if I had run it on down to fumes, but that's not a good idea for reasons already posted. That's all from driving technique and a 25 mile commute...gotta make up for it somehow! Gotta love the 5-speed.