There is no difference in fuel. It doesn't have the on road tax on it. It is dyed red so that highway patrol can check for it and determine if you are running it. Most stations that sell it you have to have an off road exemption / farm certificate to buy it. It won't harm your car but it is a horrible fine if you get caught. 1 tank will hang around red for a while because the due soaks in to the filter, lines, tank, etc. take it from someone who knows...


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