I've probably said this before. But I work on a 'rule of thumb' method being that any vehicle that was manufactured before the year 2000 to not use e10 at all, regardless of the VACC official safe listing on compatible vehicles. Reason being that most cars the were built before 2000 (though ok to run on e10) were never really built specifically run on that fuel. And as a pre-caution wouldn't use it, just to be on the safe side of things. Even vehicles built between 2000 - 2005, it pays to check suitability with not only the VACC website, but the manufactures themself.
I found by that some common car models even up to a 2007 built were not recommended to run on e10. And some cars were ok to run on e5, which is the European standard, but not the e10 being Australian standard. So it definetaly pays to check.
As for running on 95 octane premium, I did find improvements in smoothness with the 4.6 V8, but definetaly no saving in fuel economy. Again, I'm sure with Australian spec RR & Discos V8, they were just about all tuned to run on the standard 91 octane unless otherwise stated in the manual, right up to 2002 for RR and most likely 2005 for the D1 & D2. So adding the higher octane, apart from a little extra smoothness and response, don't think it's worth spending the extra 10c a litre more.
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