Water-Bug wrote:
It has nothing to do with fuel. When you arrive in Florida, you get stuck behind senior citizens that are driving 20 mph under the limit. This puts your engine outside it's peak operating efficiency. When you finally get out from behind the senior, you instinctively nail it out of frustration, striking another blow at fuel economy. :)
This may be the most accurate explanation yet, but you forgot to mention the hard acceleration to escape the morons tailgating you traveling 30 mph or more over the posted limit on the interstates. :B