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Here's some food for thoughts. For diesel fuel, you usually want the lowest grade fuel you can find. Diesel fuel is generally rated by the cetane number. Higher cetane is higher grade and has a lower ignition delay. Lower cetane fuel on the other hand is generally denser and has an higher btu content, but you can still compensate for the longer ignition delay by advancing timing. That's what I've been told by truckers lately, and it's interesting enough my best tank so far has been on the cheapest fuel.
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