Error of Fact: Windows 7 (English Taxi)

In the inaugural post on this new blog of mine, which I will say I have had the idea of beginning for quite a while now, I give you the latest blunder in the already shoddy advertising campaign for Windows 7. This blunder is an error of fact, a mistake that results from the copywriters not thinking too thoroughly about the premise that they inherently propose in the brief commercial's narrative, or not thinking that the viewing public would think too thoroughly about it. Essentially, the premise that we the public are to believe is that this British latest in the series of improbably self-important characters, who consistently attribute the "redesign" of the Windows operating system embodied in Windows 7 to their own particular merits, asserts her own merit in a casual taxi ride in what appears to be London - a scenario which she avers approximates the scenario during which she was touched by the inspiration to change Windows. The error in this premise is when she later avers, in vouching for Windows' improved speed and reliability, that the new system is "miles better" than the last. Notice anything off about this comment? (Remember, she is a British female riding a taxi in a British city.)

Yes, indeed: Why why why would a young British female, whose entire natural life has been physically measured by the metric system, suddenly and casually present her panegyrizing figure of speech using the unit system, which counts its increments of distance in miles? Shouldn't she have said "kilometers better" in keeping with her supposed upbringing, or are we the audience supposed to (a) hear her mistake and assume that the figure is an international and measurement-system-disregarding fixity or (b) gloss over her mistake presumably in our newly instilled and single-minded infatuation into the capacities of Windows 7? What gives, Microsoft?

Blunder Buzz: C.