Well taking a idle consumption of 0.3 gallons per hour (I don't know what it is for a VR, but research shows that what's a 2.5 V6 does so close enough). Say it's 55 litres in the tank. 55 litres = 12 gallons At 0.3 gallons/hour I make that to be about 40 hours. So yea, around 40/45 hours. Anyone going to give it a go?