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               Originally Posted by 
              SimonRoma  
              Good point, I would go back to the original plug and try 3 tankfulls as if you make only 1 change at a time you have a chance of understanding the changes.....I found a slight increase in fuel consumtion when I fitted the Stage 2 DNA filter but I think that this was down to a new er even-open throttle hehehe.....
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         I forget to mention that i fitted the plug a couple of months ago and didn't notice a change in anything.
         
        
 It's only since putting in the DNA stage 1 that i've seen such a drop in MPG.
         
        
 Mike