It seems that ever since I added the 91 octane gas, my car doesn't stall anymore. I don't mind good gas but it's $.92/L. Is there something that I can do to be able to run regular gas without stalling?

 

i'm assuming you have a vg30e considering you buy gas by the litre. the engine should run fine on regular. octane rating isn't going to cause the engine to stall anyway. look elsewhere for the cause.

 

The car stalled anywhere from 2 times an hour to every 5 min. Ever since I put the 91 octane in at a full tank, the car has not stalled even after 5 hrs of driving.???????????

 

The premium gas may have more detergents to clean your injectors, & fuel system.......a possibility?

 

I buy gas by the litre and I have a VE???

 

the question really is how is the octane rating calculated where you live?
in the US it's calculated with this formula (R+M)/2=octane rating
http://www.answers.com/topic/octane-rating-1

 

so is that like almost 4 dollars a gallon

 

I think 1 gal = 3.87L or close to that.

 

Ah good old Canada, I assumed he was from AU or some other VE-less territory. I guess MB stands for Manitoba now that I think about it. It also stands for 'my bad'

 

Well, today it attempted to stall but I was going 120km/h and kept going.

 

I run my car (a vg30e) on medium grade (89 octane?) and I don't have any problems. It doesn't cost any more than regular unleaded (87) so that's what I buy.

Also, I've noticed that any grade other than premium is blended with "up to 10% ethanol"-- or at least it is around here. Could that be your problem? I've heard some cars don't do well with ethanol.