phill chinn

Like a right twonk, I left my petrol cap on the boot, didn't replace it and drove of, only for me to discover it 2 days later. Would this have any affect on consumption, as I seam to have got less miles out of a tank, I don’t think it was a syphoning incident, as my gauge took on the appearance of a second rev counter.
Does any one know were I can get a cap from, will a non scooby cap fit, will a UK cap fit etc,etc,