While SUVs have become more fuel-efficient, explains Champion, the greater number on the road has lowered the average fuel mileage.
Fuel having a high ´natural´ cetane number obtained through high energy paraffin content may provide better fuel mileage than lower energy fuel or fuel with poor natural burning characteristics plus a cetane improver, if ambient temperatures are adequate to prevent gelling of the high paraffin fuel.
The cetane number is perhaps the characteristic most associated with premium diesel fuel, as an analogy to premium gasoline with higher octane ratings.
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