Yep. Ken and Dino nailed it. Too much time to fuel that, for almost no benefit. If you were closer, say 1-2 gallons, you could stop for a quick splash but you'd only gain a little and lose out on the tires. So 6-8 gallons is the time it takes to change tires. Not sure what that is in liters but well... damn the metrics.
PS I wish we used the metric system.