Probably nothing considering people *actually* fill their car up in moneys-worth.

He was more than likely doing a quick conversion in his head between US and Canadian dollars.

You see, in the real world people fill their cars up with petrol (gas) rather than measures.

It's hard to tell nowadays what people do. With self service petrol pumps and extensive use of credit cards rather than cash who knows? It's difficult to tell even from the pump display given the speed of delivery which makes it difficult to put in exact amounts.

Logically, if someone is continually using their car on a daily basis they might as well tank up (or nearly so to avoid spillage). Else what's the point in having to go buy petrol more frequently than you have to. It all costs just the same.

In my case I tend to put in enough to meet my journey requirements for the week (typically 25 L) allowing a more or less routine visit to the station. Cost you can't do anything about so why bother. It helps when it comes to assessing the cost of running a car of course and we should be conscious of these things.

The real importance of measurement is, as always, that fuel stations price in the same units. It's easy to see then how they compare. After all you get more for your ten quid at 79.9p/L than 81.9p/L if that's the way you buy it.

Phil Hall

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