Ok so I did the test MF described on a piece of cardboard, straight petrol, his fuel and 25:1 mix. After an hour could not see the petrol, his fuel left a slight stain and the 25:1 left a decent stain so I'm figuring he may have added oil but maybe at about 50:1 I should have got an endoscope years ago, just never got around to it.
speedy, good call I hadn't thought about Cash Converters
Tyler, you always have an angle on everything, things I would never have thought about
AVB, there is always something out there to trip you up but I think the fuel on the cardboard trick must be fairly accurate
