Are you or anyone else saying that 5 liters of anything is a smaller quantity than 5 gallons. (I think not, though possibly, if you are talking "Imperial gallons")? Is an Imperial (i may be misspelling imperial here) gallon the same quantity as a liter (1000 ml.)? To our Canadian members do they still sell gasoline in Canada in Imperial gallons as they have done in the past? I am just asking for information though if the answers ansl make a point, so be it......Regards!
5 litres is just a little bit more (~ 5%) than 5 US quarts (a US quart is 0.946 litres) - i.e. just slightly larger than 1.25 US gallons.
5 litres is also just a little bit larger (~4.5%) than an Imperial Gallon.
An Imperial gallon is equal to 160 Imperial fluid ounces which is equal to four Imperial quarts. An Imperial quart is 40 Imperial ounces. An Imperial pint is 20 Imperial fluid ounces, and the perfect size for a nice, cool (not cold) glass of beer.
The Imperial fluid ounce is slightly smaller than the US fluid ounce - about 96% of the size of the US version.
The US versions are actually older than the Imperial ones - the UK changed while the US kept the measures that were around in the late 1700s. There are a lot of other complicating factors as well.
Officially, we in Canada are metric - there are very few remnants of Imperial measures here now. Gas has been sold by the litre for decades now. And when things are expressed in fluid ounces or any other non-metric measures, the expression is usually in the US version of those measures, due to the prevalence of US products and marketing here.
I live really close to Point Roberts, Washington, which is a tiny US community that you can only get to by water, helicopter or through Canada. Allmost all of the people who live, visit or shop there are Canadian, so it is one of only a couple of US communities where gas is sold by the litre.