That's a turbocharged engine; be very careful!
This makes sense. If GM makes a car that requires premium fuel or else big problems, then they can they can just forget about the entire market for rental cars for that model. For example, I've rented a VW Golf from Hertz several times at airports and they have the same recommendations about premium fuel. I've filled them with regular and didn't notice any difference. I want to save as much as possible on gas because it gets charged to a project budget in the company. I'm sure that most everybody else does that with airport rental vehicles also. I'm sure that Hertz knows their fleets and how much abuse they can handle.The manual for my 2019 XT4 specifically says,
"Premium unleaded gasoline meeting ASTM spec D4814 with a posted octane of 93 is highly recommended for best performance and fuel economy."
It goes on to say "unleaded gasoline with an octane rating as low as 87 can be used. Using octane below 93 will lead to reduced acceleration and fuel economy. If knocking occurs use a 93 octane as soon as possible otherwise the engine could be damaged.
91 octane called mid grade is sold here and I've been using it with no problems.
Me personally I would think that 91 Octane would be very OK to use. (Yes 91 is better than 87 or 89) You may want to try a tank of both 91 & 93/94 to see if you notice any differences.Is 91 octane better than 87 or 89 for this engine?
93 is harder to find where I live where most stations have 91 as the highest octane gas. There are a few with 94 but not conveniently located.
I have been using 91 since first fill up (doubtful the first tank dealer provided was anything better than regular ). Just wondering if 91 would be good enough?
Thanks, Marc.Me personally I would think that 91 Octane would be very OK to use. (Yes 91 is better than 87 or 89) You may want to try a tank of both 91 & 93/94 to see if you notice any differences.
Okay, now after driving my first FULL week and one FULL tank of gas I calculated the costs difference by using Premium gasoline.Thanks, Marc.
Will try and compare 91 with 94 to see any difference, if any in performance and/or fuel economy.
I am a low mileage guy. I have filled up three times since my last post both from empty. The first tank I filled with Mobil 93 and did not notice much difference I was averaging 18MPG in all city stop and go traffic. I switched to Marathon 93 and mileage boosted to 20 and car ran smoother. I pay particular attention to auto stop and it is definitely a cleaner start with a smoother idle. I am now convinced that Mobil gas I used was not 93. So in summary I will be using premium from now on. Difference is regular $2.80 to premium $3.30 mid grade is $3.10.I am running my tank to empty (filled with regular) as we speak and will do a Premium fill to see if I notice any difference. I will report back.