Quote:
Originally Posted by jakobnev
A car that measures fuel use by duty cycle might falsely report improved mileage with cleaner injectors.
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I suppose that would be the case.
Personally I have a tough time believing anything fuel chemistry related will give you 5% better FE, aside from 5% more energy in the fuel. At least on common rail diesels. On the older pump-line-nozzle diesels, the fuel characteristics could actually change your injection timing. And your ignition delays were much longer then, so some cetane improvement could help you out. I don't think cetane matters nearly as much on common rails.
I could also see a cleaner giving you some improvement if your fuel system was dirty, but the claims are you'll get a 5% improvement regardless.
I'm thinking about taking them up on it. I need to run some cleaner anyway. If I don't get a 5% increase maybe I'll get my money back, therefore free cleaner
