Vortex is 95 Ron
Vortex98 is 98 Ron

Personally I have never seen a noticable differance between 95 and 98, but then my car is stock. I find that it is worth changing to 95 from 91 (ULP) Engine runs smoother, Better milage.

i go with Vortex car runs beeter and gets more ecconomy then optimax.

personally i dont like supporting shell we have a shell survo in town and its the only survo in town so they are f**k ripoffs last time i checked unleaded was $1 14.9 per L.

Shell dont own those trucks (for that matter I dont think any fuel companies own their own trucks). They use contractors and some contractors service more than one fuel company. That is probably why you saw a shell truck at 7/11. And back on topic I dont notice a difference on optimax when compared with ULP. BP ultimate on the other hand I found is cheaper to run than ULP due to the extra K's I get out of a tank. I sat down one day and did the sums and figured that premium works out to be roughly 30 cents per 100 K's cheaper than ULP. Thats what Ive found anyway.

well a bit of an update for you, since putting the vortex stuff in the car a week ago, i have done only city driving, and the car is running smoother, less pinging, and this is on the first tank, altho i did run my last tank of ULP empty.
I have a few hundred kilometers to run this week country driving so will see how it goes, as well as after a few more tanks.

I put plain PULP (98 RON just doesn't seem worth it) in my car the other week but can't really notice any change tbh. I'm still pulling 16L/100km on the TC for city driving and it doesn't feel any more sprightly than before. I'm going to reserve final judgement until I run a few more tanks through her though as it still had about 1/4 of a tank of regular ULP in it when I put the PULP in so that may be diluting it somewhat.

My local Shell is $1.149 p/l for optimax.

Run a few tanks of BP Ultimate 98 thru it a while ago and wasnt real impressed. Just didnt seem as lively and it didnt go as far as optimax.