We have 8 of the VP & Sunoco jugs. We also bring several red lawnmower cans to refill the fast-flow jugs. Comes in handy at tracks where the track pumps don't work and the only gas station for many miles has only two pumps (like CMP last year). We refill Saturday evening. The red cans should solve the NJ issue, I would think, but we don't go that far for races.
Huskar's advice is true. We modded several of our jugs' caps with 1" ID PVC through-hull fittings and vinyl hoses (and fuel-proof sealant), and ported out the inlet restriction in the car's filler neck so the bigger tube will fit. Used a 3/8" thru-hull for the vent tube in the jug. We aren't at Indy/NASCAR fill rates, but can empty a 5 gallon jug (with 5.5 gallons) into the car in <21 seconds. I forget the exact formula, but flow rate goes up by about 4x if you double the diameter of the tube, so a 1" ID tube flows way faster than a 3/4" ID. We tried a 1 1/4" ID tube, but found it blocked the air from exiting the tank as the gas went in and actually slowed us down.