Sure this has been posted prior, so sorry if this is ancient history.
Just returned from a very enjoyable 7 hr round road trip in my D to Donnelly River and back, as an experiment I started with a tank full of 98 and then filled up from empty with tank of standard 91 for the trip back over the exact same route, long hills and all. The run was done at the speed limit ~100-110 kph most of the way regardless of incline.
I know many are happy running 91 in the D, though the manual specs are for 98 in a late model DS, however I can emphatically report that the pinging was very noticeable on the trip home, whereas I only got some pinging while gunning on one long climb on the way down.
I'm not saying anyone's right or wrong using either, as price and usage is a factor, but there is no doubt in my mind anymore that my particular motor (again not all) runs much happier on 98 (which I have always been using to date).
Cheers
M
Just returned from a very enjoyable 7 hr round road trip in my D to Donnelly River and back, as an experiment I started with a tank full of 98 and then filled up from empty with tank of standard 91 for the trip back over the exact same route, long hills and all. The run was done at the speed limit ~100-110 kph most of the way regardless of incline.
I know many are happy running 91 in the D, though the manual specs are for 98 in a late model DS, however I can emphatically report that the pinging was very noticeable on the trip home, whereas I only got some pinging while gunning on one long climb on the way down.
I'm not saying anyone's right or wrong using either, as price and usage is a factor, but there is no doubt in my mind anymore that my particular motor (again not all) runs much happier on 98 (which I have always been using to date).
Cheers
M
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