ASDA (subsidiary of Wal-Mart) fuel stations in the UK always have the fuel price ending in .8 (e.g. 175.8p per litre) while pretty much EVERY other fuel station always has prices ending in .9.

It gives a feeling that they're slightly cheaper than the competition, I think. Even if the more significant digit is more expensive sometimes, people don't remember that part as much because it varies from day to day.