Petrol, unleaded for us Americans, is relatively easy to get in Maseru. Stations are not easy to find outside of the main city. They can be found at main intersections throughout the country, but you are encouraged to gas up whenever you see one. It is also common for stations to be out of petrol, so it is best to top up even if you know there is a station up the road. Your favorite might be out for the day.
My last till slip (receipt) information is below. This filled the tank for about 7 days of normal use. I have been meaning to write down the milage for months, but haven't done it. With an exchange rate of 8.45R/$ we are paying about $79.53 each week for fuel.
10.20Rand per Liter
82.53 VAT included (value added tax of 14%)
Diesel is easy to find and maybe would have been a better choice, but we didn't know that when we moved here.