corn oil was not the ideal, rapeseed is thinner and therefor works better.
i found i lost at most 2mpg, but then its half the price of diesel, so even if you did half your normal mpg it would be worth it ( if your running 100% oil ).
i dont mind going into tescos and getting it. if you go every couple of days and just get a few it doesnt look so stupid.
what makes life even worse it that i filled up my mondeo on tuesday night. got a 50/50mix in thereso about £45 and the car did 3 miles and died on me wdnesday morning. so i have about 62 litres in the car and 20 llitres ready for the next time i was going to fill up ready in the boot