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Just purchased a Denali. Actually have not got gas yet. What is everyone's thoughts on using Premium Vs mid-grade gas? Thanks
 

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We use 89 for around town driving and 92/93 when we're going to do mostly hwy driving. Haven't noticed any problems when using 89, but the wife drives most of the time and wouldn't notice anything unless it was really noticeable.
 

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From my understanding you need the recommended 92/93 only when you want to use it at its limit of tow or hp capabilities...
Carrying a few passengers in city and highway should be fine with 87.

there are threads here about how the new engines/ECM etc deals with the different octane values...so no fear of knocking etc.
 

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I got the 1.5 with the turbo and I run 87 regular without exception. I have all the power I need (especially compared to the slug that was my old Rav4) and my lifetime fuel mileage is 30.8 mpg.


Tim
 

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We have a 2018 SLT with 2.0T. For the first 9K miles we used 93 octane gas. The last 6K miles we have used 89 octane.
Our average MPG on 93 was 24/25 and the MPG on 89 octane has been 25/26. We haven't noticed and difference in performance and our gas mileage has been slightly better. Our driving has been fairly even between city, highway, and interstate. Our next fill up will be 87 octane and we will try that for awhile.
 

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I've been using 92 octane since I bought my 18 Equinox in late June. I've considered running mid-grade but I usually buy gas at Costco and they only offer regular or premium.
 

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I've been using 87 in my 2.0 Turbo after the first two tanks. Overall fuel mileage is at 25.8, with mostly short trips with stop and go. When I do need to accelerate quickly, I haven't noticed any real difference from the first two tanks.
 

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I've been using 92 octane since I bought my 18 Equinox in late June. I've considered running mid-grade but I usually buy gas at Costco and they only offer regular or premium.

You can "make" your own mid-grade gasoline by alternating your fill-ups between regular and premium.
 

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I just drove 1300 miles (NE to AZ) in our '18 2.0L Equinox. Due to the big price difference between 87 and 91, coupled with the varying octane numbers in various states, I ended up filling up with either 87 or 88. Not counting driving through the 3 inches of slush in NE, our highway mileage was consistently at 30 mpg + or - .
At home, I fill up at Costco with 91, but then most of the driving is local with little interstate driving.
I a couple weeks I'll make the return trip, so I'll see if there's a difference going uphill :)

So far I am very happy with the mileage on this vehicle. For trips I wish it had a. bigger tank, but by the time it's needing a fill-up, I need a drain down:)

I noticed that the spread between diesel and gas at interstate gas stations is huge compared to at home.
 

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Other than the first tank that the dealer presumably put in at 91 we have not on our 18 Terrain SLT with 2.0 used anything but 87. My wife averages about 7.1 to 7.9l per 100km but with the crummy winter gas it has since gone to 8.6 or so still pretty respectable. The only vehicle I ever drove that really you could tell works great on 91 was a 97 Pontiac GTP with Supercharger, wow did that thing ever bog with 87 in it but did ok with the 91. In my area, the price of Premium 91 and up was 45 cents more than 87 or roughly a little more than the spread between Diesel and Regular. They must be trying to hose all those audi and Mercedes folks.
 

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just picked up a 19' Terrain SLT with the 2.0L Turbo....wondering how big the tank is?

14.7 gallons for the FWD model.
15.5 gallons for the AWD model.
 

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.

This is regarding the 2.0 turbo; the recommended fuel for the 1.5 turbo is regular grade 87 octane.

So far all that I use is Top Tier Phillips 91 octane, no ethanol or BP 93 octane, with ethanol.

I'm just a little gun shy of using 87 octane because of a potential LSPI issue with these direct injected turbo engines: Just not willing to gamble with an engine failure if better fuel can potentially avoid it.

Remember, LSPI is an issue among various manufacturers using small displacement, direct injected, boosted induction engines, and the cause hasn't been completely understood or resolved yet.

I also use a Dexos1, Gen2, certified oil: Mobil1 Extended Performance 5W-30 in my 2019, 2.0 Equinox, to also aid in preventing the LSPI phenomenon.

If the GM powertrain engineers recommend premium fuel, I'm going with that recommendation.

.
 

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Dealer said when filling up to only put the nozzle in half way....and if ever need to use a gas can to push nozzle all the way in....what's all this about...?...this is on our 19 Terrain with capless fuel filler....wife cant seem to totally fill up the tank before it auto stops...
 

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13000 miles, 90% on 87 gas, lots of power, lifetime 25.8 mpg. That includes 2018 and half 2019 Canadian winter with some -30F temps. Highway trips below freezing at 30 mpg in the COLD. Best was 35 in summer. No issues at all.
 

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If the GM powertrain engineers recommend premium fuel, I'm going with that recommendation.
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I would tend to agree. Even though its "only recommended" and not required, I fill with 91 octane Premium 10% ethanol. Our gas here is Oregon is 87, 89, and 91 octane. Stations offering non-ethanol are few and far between and it's significantly higher priced.
 
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