Like to run tank full now and then in the hope it cleans the system out and I do notice a difference.
Something I noticed after a good run was how much loader the exhaust note was, as though a silencer baffle had come lose or something clogged became unclogged like the cats.
And how much extra popping of the exhaust happened on the overrun.
Even to the point of being embarrassed when a couple looked around to find out which chav was making the noise.
Quite sporty
Having put on my sensible head last week put Sainburys cheaper super unleaded in.
I notice all the popping has gone or barely noticeable
The only other factor was I was driving 1st to 10, 2nd to 20, 3rd at 30mph and so forth, as it makes the exhaust sportier.
With Sainsburys fuel just a muffled drone and barely a pop on overrun, same with straight unleaded.
A Jaguar fuel engineer friend tells me the pops are just over rich mixture igniting in the exhaust.
So does the Nitro change the fuelling as well as possibly the ignition timing via knock sensors?