I don't know this as fact but my opinion is that the Focus engine was never mapped for our crappy fuel. After our first tank (as provided bythe dealer) of standard unleaded and being mightily unimpressed with the performance compared to the test mule we drove, we have since put nothing but Premium in the car and the difference is astounding. The car has excellent pick-up and there is no more need to drop two gears when a hill comes at you. The difference in fuel eceonomy is also remarkable - mostly due to the fact you don't have to push it to hard.
When I approached the dealer about whether they put premium fuel in their test cars, he queitly replied with 'most of the time'.
We rarely put standard unleaded in our Commodore and always planned to fill the Focus with premium anyway, but a 'heads up' from the dealer would not have gone astray. I wonder how many Focus owners aren't aware that they could actually save money by filling them with Premium.
By the way, my wife absolutely LOVES the car and we haven't missed the VT one bit.
BamBam - ThankYou Maam
Why ? Because I Can :-)