I tried a 1/2 tank of 87 did not notice any change in performance. I took a look at my 1990 Range Rover Manual and it says Premium 90/92 AKI - RON (England) 95. Not to put in any lower than 90/92 AKI. I think you guys read the manual wrong when you read 90/92 RON it's 95 RON.
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The City is a Jungle. 
1999 LR Disco II SD The Rhino 
1991 RRC (Sold) We will miss the Turtle 
1988 RRC (sold)
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