The fact of the matter is, these machines just do not like 91 non-ethanol fuel when it's even somewhat cold outside. If you have a Polaris Ranger Crew, we at Everything Polaris Ranger suggest running 87 octane fuel in your Pro Star engine, provided that it’s not turboed. E85 is usually higher octane, but it starts poorly in the cold without at least a little hot air to get it going. There is no advantage to running 91 or premium fuels, in fact, they can actually be detrimental. This is how it has been since 2013, so if your Crew is after that year, try to run 87 non-ethanol fuel. Besides, many Crews, RZRs and other Rangers have stickers by the gas cap saying min 87, not min 91. A friend of the site told us he would have sworn he had a fuel pressure issue. Turns out they just don’t start correctly on 91, so run 87.
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