I use 91 in the FJ. I did have a 6 month spell on 95. I used to keep a log of ride routes/fuel stops and fuel used ... usually between .2 and .5 of the amount of fuel used at the same fuel stops on the same route. The only increase was a trip into a strong nor-wester ... and about an extra liter was burnt.
The only noticeable change in the 91/95 choice was the cost.
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