SeaFury 🦜🍃Diesel is 294.9c/L, down 1c from yesterday 🥰 #fuel #launceston
I have a theory that you get slightly more fuel if you fill up in increments vs doing an empty to full fill in one go. What do you think? #poll #fuel
Same
More in increments
More in one fill
No opinion
Poll ended at .
Mark Whybird@SeaFury It is a genuine physical property of petroleum that it takes up slightly more volume when agitated. You absolutely can and will get slightly more if you pump it in a slow, steady stream than if you jam it in as fast as the pump will allow. I’d love someone to do the math on just how much; I don’t think it’s a particularly noticeable amount and I’m certain just driving calmly etc. will have a much bigger effect.
(Note: this is not the fuel station ripping you off: they absolutely DID pump 50 litres or 20 hogsheads or whatever into your tank… and then when it settled, it genuinely BECAME only 49.x liters. It’s a time trade off that is actually unavoidable, though of course in finding the right balance, they are motivated in perhaps a different way than you, the consumer.)
WildRikku@wildrikku @SeaFury I’m talking about the volume increase during the pumping into your tank at the fuel station. You will genuinely pump some amount and then genuinely have slightly less than that after it settles, before your car uses it.
But it is irrelevant for another reason, as I thought: the amount is negligible at the agitation levels we are talking about. Your response made me go and skim the science of it, and this figure:
, for example, suggests that at the agitation levels in actual domestic pumping, the amount is probably waaaaay less than 1%. Looks like it might be a few percent at the ridiculous rates race cars fill up at in a pit stop, which they probably account for in their design and planning and otherwise dont care about.