I don't put anything less than 89 in my TE. I once put 87 in by accident and it was not a happy puppy. Never again. 99% of the time I put 91. With 87 I get a little less MPG so the savings of .10c a gallon close to cancel each other out.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k