Question about 2003 Honda VTX

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Only getting 20 to 26 miles per gallon. Usually gets 29 to 31. Replaced fuel pressure regulator, spark plug wires. Useing power commander and bike runs good but low miles per gallon?

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You don't say how many miles you have on the bike or if you replaced fuel filter at the same time or sparkplugs too..How is the aircleaner ? Do you use choke a lot.VTX's seem to be touchy if the choke is over used.How about the aftermarket power commander.Are you running factory pipes.Let that baby breath Remember the engine is a pump The idea is to get the right ratio of air and fuel in and allow enough discharge orexhaust toget out..Hope this is a little help

Posted on Dec 31, 2010

  • cm411 Jan 01, 2011

    The bike has Vance and Hynes pipes and an air cleaner open to the air. And doesn't make a difference if cleaner is mounted of not. The ingine is fuel injected/no choke. The Power Commander was original from the manufacturer. Recently when the turn the bike off, I hear a gurgeling sound like fluid equalizing or some thing. The PC was set with the original map for VH and a 1800cc VTX. It runs smoothly from idle to high speed. But plugs blacken and mileage has dropped about 5mpg. Plug life has always been very low from time I bought the bike with 2000 miles on it. So, thoughts are a bad ECM and or oil getting into the combustion chamber. Or a bad senson, temperature or barometric pressure. Really stumped.

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