Im not if anything im having a laugh about it, the point that i was making is that (in more detail) say you take a 172 and a cup there is around a 80kg weight difference, if mr cup has just filled his car up and the 172 that happens to pull up next to him with the petrol light on then this weight advantage is some what lost since around 1L of fuel is around 1kg-ish than thats around 40kg heavier. 80-40 = 40kg
then you could some stuff in the boot maybe a spare wheel (cups dont have one do they? cant remember) and the weight loss is quickly so would be slower, but then again the same could be said for the 172.
Im talking about an everyday situation anyway, personally i couldnt care less if you pull away from me as i would be too busy laughing my arse off