Super Premium. It is what Nissan recommends and the savings by using cheaper gas is not worth it.
The simple fact of the matter is the cost savings over a period of one year will be less than $250 in most cases. Even if you assume a $0.50 savings per gallon, filling up 18 gallons weekly for one year still nets a savings of less than $500. For a $30,000+ vehicle, I don't think $500 qualifies as enough savings to use cheaper gas which in the manual is specifically not recommended for any use other than temporary.
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