Dead right geoffa1, the UK's on-the-road pricing doesn't work here as the States taxes are all different. What the government has to do to appease the many irritated consumers who drove this legislation [in both countries], and who would probably accept the small taxes/insurances added on as necessary evils on top of the list price, but who loathe the delivery scam, is to phrase the law so that the published price includes these dealer charges, so they disappear.
When I purchased my imported boat I paid a published amount, [many times an EOS's price admittedly], but I did not pay extra for the dealer to fettle it for me before it was serviceable, merely the applicable State taxes. These are issued by the government, so are readily accessible, unlike the far more furtive dealer charges. I don't know of any other consumer items that include this type of rigmarole. I would not be happy to be charged extra for a jeweler to fit the battery into a new watch I bought before I could use it, for example.
What deals are available to businesses, with all their tax offsets etc, is a different tale, and of little interest to the average consumer. They employ people to work it out.
Still, it will be all resolved when we all come to our senses here and actually become a country, not a Commonwealth of States and Territories, at savings to the nation calculated as running into the billions, won't it? How many States is my driving licence actually valid for?