Thanks . But I am not running a bloody tractor!!!!!!!!!!!!. The yam 250 HPDI 2t is state of the art, software version 99999.0000, developed over the years by very talented peole, and operated by an --- idiot. These motors are
"delicate' themselves as regards fuel- and anything below 90 octane - probably will cause damage.I am not prepared to throw away 12000 euros worth of enginering wonder. LPG on the other hand can only do "good" to the
engine- for one thing dramatically reduce deposits.
I would nominate Codders to run a test using HIS engine- as he was the one who suggested this in the first place.