Hey Tom-
you can do it! my gas light comes on at 2 bars and I've gone 25 miles after that and filled 10 gallons. I have the 11.8 gallon tank (pzev) so that means with 2 bars there's at least a gallon left. If you've got 4 bars- AND your tank holds more- you've got to have at least 2.5 gallons left
so go for it.
Myles & I are going for the first pzev 600 mile tank. ok- so it's not the first....but it will be a first for us! don't think I'm going to make it this tank though- I was doing really good till last week when it got cool again, and my mileage went back down to 49 from 54. bummer.

KLC
2005 HCH CVT 'Verdigeek'