ArmatageShanks
Honorary Master
I'm not quite sure but what I do knows is, you'll use less the faster you go.
Say you're doing 120km/h and use 10l/100km, because you get there faster you'll use less fuel than say travelling at 60km/h and using 7l/100km. Simply maths - half the time taken so less fuel used.
Also you're lucky - travelling at 120km/h in a Polo, as it's a small relatively streamlined car, you'll go quicker than someone travelling 120km/h in an SUV or bakkie.
