One more thing to add to your kit:
Groucho Marx novelty glasses
Put them on just before you get to a passing lane. It really freaks out the jerks that have been riding your [censored] for miles. They simply can't resist casting a dirty look as they go around you.
When my kids were small, we vacationed in a VW Westphalia Diesel (1984 non-turbo). After several years of meeting angry glares with Groucho glasses (and teeth bared around a big unlit cigar), the kids came up with their own hand-painted bumper sticker: "If you can't go fast - Go fun!"
