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. :)
x2!!! I haven't noticed the mpg drop, but then again I haven't ever bought diesel in any place other than Florida. In about a month, I'll be buying fuel in Georgia, so I can test your theory.