I just heard on Radio 4 that Which magazine has published a report comparing 3 "superfuels", two petrol and one diesel brand, to the standard versions. Their conclusions were that there were no significant differences in either performance or economy. Have not found a link to this particular report yet, but found a similar article from What Car last year with similar conclusions:
http://www.whatcar.com/news-special-report.aspx?NA=228253&EL=3217474
I suspect, with current high prices, we may be seeing less of these fuels.
http://www.whatcar.com/news-special-report.aspx?NA=228253&EL=3217474
I suspect, with current high prices, we may be seeing less of these fuels.