I didn’t say a generic map, I said “a good mapper” so you comment is pointless (although “good mapper” isn’t the best terminology)
I know 2 “good mappers” with rolling roads at their disposal one I would use for diesel and one I would use for petrol although the diesel guy can do petrol as well. There are plenty of genuine guys that are well known and have good reputations. I still don’t see the point in your post/reply to me asking how many good mappers do I know.