Well, I saw sompun differ't da other day....a Prius that wasn't going for mpg but just going. On a four lane section of highway I was moving 2 or 3 mph slower than the speed limit in the right hand lane. A smaller truck pulling a trailer passed me doing ~ 5mph over the speed limit in the left lane. Tailgating him was a Prius. Once they both were passed me, the Prius snapped into my lane & accelerated past the already speeding truck & trailer by at least 15mph.... maybe a bit more. He past out of sight over a hill ahead of me. After topping the hill, I had a clear view for a half a mile ahead. A state trooper had pulled the Prius over & was giving him a speeding ticket.