Wrong Gallons for UK user
 

MPG showing in miles per US gallon rather than Mile per Imperial Gallon. e.g. latest fill up shows as 38.1 mpg (324 miles & 32.18 litres) whereas using Imp. gallons it should be 45.8

Make sure you set the site to show UK units by clicking the "UK" link in the upper-left corner of any page. We set that value as a cookie, so you'll need to click that link anytime you visit the site in a new browser. But once set, the cookie never expires.

That'll be it thanks. Just installed new OS - Phew I thought I had a serious problem for a minute there :)