Interesting point. For many years, I've filled up and rounded it off to the £ as it suits me to do it that way; each to their own.I don't buy it in gallons or litres but by the £
However, when I was an HGV driver, I always did the same thing. One day my supervisor called me in as he'd had some fuel dockets in with odd amounts of pence on them. Long story short; turned out that an employee had been using the fuel account for his own car not knowing I rounded my truck fill up to the £ which my supervisor knew I did.
Swift exit of one employee - !