In my opinion in shopper it is ok that the scheme has petrol, coz you can get them from cr8s, you don't have them in your weapons. So it is not so frequent to have it. And if you are expert in shopper, then you can think about that your opponent may have petrols, so you won't take hides where you can be blocked.
Honestly I don't like petrols in shopper, but I can live with that..
In ANO's wxw scheme you have petrols from the beginning of the game, and that is really bad I guess. They are usually really useless in wxw. I wouldn't miss petrols from wxw scheme, coz I don't like being blocked in wxw. They are just bad like the shortcuts on barman's maps xD (joke

)