I use biodiesel in my fiesta tdci
I get around 400-420 miles to my tank.
Mainly sitting at 70 on the motorway, I do 64 miles per day.
I fill up every week , just like I used to on regular diesel.
Although my economy has dropped by around 100 miles, this could be partly to do with the 17" wheels, I am not too sure.
Performance wise is is a bit slower, but money wise, it costs me 70p per litre, averaging £26 per week to fill up.
This means I am saving at least £10 per week on fuel.
That saving is now going into my savings account .