I'm not a scientist, but I've read that increased ethanol content will decrease kpg/mpg. My understanding is that the ethanol does not burn as well as gasoline (or something like that). Therefore, the engine runs less efficiently. Has there been a recent change in gasoline/ethanol mixture? I have always had about 48 mpg with a mix of highway/town riding.
In the US, I believe current ethanol content is about 10%. As long as I've been riding, the ethanol content has been the same. I recently read that the US government will allow a 20% ethanol content in the fairly near future. Gas stations will need to clearly indicate what pumps are using the 20% mixture, as this will adversely effect many older vehicles.
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