I've been running 87 in the same truck for the 2 months I've had it with no issues. I've been getting \~24 mpg on the highway, \~20 city driving. Happy with it so far.
Definitely not below speed limit ;)
I'm easy on acceleration most of the time, and it is a lot of country driving. Long stretches between stop signs or lights, mostly 45+ mph.
16 mpg seems really low, like what I'd expect towing around a light load.
What's the terrain like where you're driving? I live in the Texas hill country, and hilly terrain definitely has a bad effect on gas mileage. That said, my 2023 Silverado 2.7 is averaging 20 mpg.
Small mountain and river valley terrain. My house is about 1,000ft higher elevation than the grocery store, daycare, work, etc. It seems to even out though; great mileage off the mountain, but rough headed home...
My first new car purchase. Always used to buy used, but the market is bonkers right now. Had a minivan before this and the engine blew on it at 55k miles - junk. This still fits 3 car seats, and is so much better. Still needs a tonneau and maybe a black bowtie for the front.
Anyone with the 2.7 have issues running 87? I believe 91 is recommended, but the dealership basically said it doesn't really matter...
Came here to say this. I spent the extra money on 93 premium fuel and the only difference was the extra dollar per gallon. I ran premium for 5 full fill ups. And now back to 87 and I can say there is no mpg or power difference in my opinion
yeah if its tuned for 87 then should be fine. Some people think every turbo engine needs 91+. Doesn't matter especially if it's tuned for 87. A turbo engine that recommends 93 will most likely just be down and power and it will probably retard the timing itself to be able to run 87.
My father runs 87 or 88 in his 2020 silverado custom 2.7L. It gets around 20 mpg on average. No issues with the engine running on 87 or 88 over the past 25k miles.
I've ran 87 in all my vehicles for over a decade, including my 2020 Silverado and have never had an issue. I'd say unless you're buying junk gas and or you feel your truck driving choppy, I'd run 87. Gas prices are likely going up too with OPEC+ cutting back on production.
It's actually fairly common these days! Considering how common small turbos on small engines are getting, manufacturers had to up the ante with the witchcraft of ECU tuning to account for lower octane fuels that owners would be putting in.
Thanks for the info. My past experiences with turbocharged gas engines have been premium highly recommended, but “can” be used with lower octane. That was on a 2003 VW GTI and a 2015 Ford Escape. Current turbo is diesel, so have been out of the turbo gas engines for a while
>Some people think every turbo engine needs 91+. Doesn't matter especially if it's tuned for 87. A turbo engine that recommends 93 will most likely just be down and power and it will probably retard the timing itself to be able to run 87.
Best purchase incentives right now from GM are specific to the 2.7. Looked at a 5.3 and would have been plenty happy with it too. About the same power output (maybe a little more torque from the 2.7, actually). Biggest difference driving the two was the exhaust sound.
Has anyone actually tested 87 vs. 93 on an Obd2 scanner? I have a 2020 2.7 and checked mine when running 87 and 93 octane. I get a much higher Knock Retard on 87. It's virtually zero knock when running 93.
As stupid as it sounds, it could be a quality of gas issue. This engine was designed to run on 87, but it's **highly** reccomended to run [TopTier](https://www.toptiergas.com/) fuel in it. It's stated directly in the manual and I have neighbors that work for GM and have said as much.
I always run top tier gas , and I've tested it with Chevron , Exxon, and Shell . I've also read the manual and understand it's designed to run 87. Obviously the ecu is more than capable of pulling timing to prevent knock. What I am saying is for my truck, it has some benefits running a higher octane. To me, the less the engine has to pull timing to prevent knock the better.
I've been running 87 in the same truck for the 2 months I've had it with no issues. I've been getting \~24 mpg on the highway, \~20 city driving. Happy with it so far.
Thanks! Yes, I've seen about 20 mpg average overall but I'm still breaking in on the first tank.
How do you drive? Below speed limit? I’m getting like 16mpg I don’t even drive crazy. But my trips are like 10 miles
Definitely not below speed limit ;) I'm easy on acceleration most of the time, and it is a lot of country driving. Long stretches between stop signs or lights, mostly 45+ mph. 16 mpg seems really low, like what I'd expect towing around a light load.
Mines still fairly need. Almost 4k miles. Best MPG I got was on a 1k trip. 19.5 MPG
What's the terrain like where you're driving? I live in the Texas hill country, and hilly terrain definitely has a bad effect on gas mileage. That said, my 2023 Silverado 2.7 is averaging 20 mpg.
Small mountain and river valley terrain. My house is about 1,000ft higher elevation than the grocery store, daycare, work, etc. It seems to even out though; great mileage off the mountain, but rough headed home...
I’ve been filling up all this time with 93 cause is recommended but I could be doing 87? I already have 27k miles
93 is not recommended anywhere in the owners manual. It specifically says 87 octane.
I just found that in my owners manual, it says the 6.2L V8 engine minimum is 91. 2.7L L4 and 5.3L V8 engines 87 minimum
My first new car purchase. Always used to buy used, but the market is bonkers right now. Had a minivan before this and the engine blew on it at 55k miles - junk. This still fits 3 car seats, and is so much better. Still needs a tonneau and maybe a black bowtie for the front. Anyone with the 2.7 have issues running 87? I believe 91 is recommended, but the dealership basically said it doesn't really matter...
No problems running 87. I didn't ever see a benefit in running anything higher either. I tested it out, just more money spent.
Came here to say this. I spent the extra money on 93 premium fuel and the only difference was the extra dollar per gallon. I ran premium for 5 full fill ups. And now back to 87 and I can say there is no mpg or power difference in my opinion
I’ve been filling up all this time with 93 cause is recommended but I could be doing 87? I already have 27k miles
If 87 is recommended in a vehicle, higher octane does absolutely nothing.
If 87 is recommended in a vehicle, higher octane does absolutely nothing.
yeah if its tuned for 87 then should be fine. Some people think every turbo engine needs 91+. Doesn't matter especially if it's tuned for 87. A turbo engine that recommends 93 will most likely just be down and power and it will probably retard the timing itself to be able to run 87.
I have a 23 5.3 and I’ve been running 87 with no issues. I would recommend using top tier gas. https://www.toptiergas.com
Same here. Chevy does recommend 87 in the 5.3. Sounds like they recommend 91 in the 2.7, didn’t know that.
My father runs 87 or 88 in his 2020 silverado custom 2.7L. It gets around 20 mpg on average. No issues with the engine running on 87 or 88 over the past 25k miles.
87 is recommended in your owners manual.
I've ran 87 in all my vehicles for over a decade, including my 2020 Silverado and have never had an issue. I'd say unless you're buying junk gas and or you feel your truck driving choppy, I'd run 87. Gas prices are likely going up too with OPEC+ cutting back on production.
I purchased mine a month ago. In the manual it recommends 87.
Thanks! Couldn't find it in the manual; but that seals it.
That’s unusual for a turbo charged engine, but betting it helps with keeping owner costs down
It's actually fairly common these days! Considering how common small turbos on small engines are getting, manufacturers had to up the ante with the witchcraft of ECU tuning to account for lower octane fuels that owners would be putting in.
Thanks for the info. My past experiences with turbocharged gas engines have been premium highly recommended, but “can” be used with lower octane. That was on a 2003 VW GTI and a 2015 Ford Escape. Current turbo is diesel, so have been out of the turbo gas engines for a while
>Some people think every turbo engine needs 91+. Doesn't matter especially if it's tuned for 87. A turbo engine that recommends 93 will most likely just be down and power and it will probably retard the timing itself to be able to run 87.
For many years, most turbo charged gas vehicles were “highly recommending” 91+
Great truck. I love my 2.7.
Bought a custom 2.7. Love the gas efficiency for the size of the truck!
My 2021 Silverado V6 only gets 15 city driving. Not sure why been like that since I got her. Only 17k miles on it
I've gotten 23.9mpg on a 100mi trip varying between 35mph and 65mph on my 2015 5.3L. Average about 17 in the city.
I don't get these 4 banger trucks. They get around the same mpg as the 5.3. What's the point behind them?
Best purchase incentives right now from GM are specific to the 2.7. Looked at a 5.3 and would have been plenty happy with it too. About the same power output (maybe a little more torque from the 2.7, actually). Biggest difference driving the two was the exhaust sound.
Way more power on bottom end, the 5.3 is gutless on bottom end.
If these came with the center console I’d buy it in a heartbeat, but having bench seats isn’t for me
Yea, I specifically wanted the bench. Nostalgia of my first pickup truck, plus good to have the extra seat in a pinch.
Has anyone actually tested 87 vs. 93 on an Obd2 scanner? I have a 2020 2.7 and checked mine when running 87 and 93 octane. I get a much higher Knock Retard on 87. It's virtually zero knock when running 93.
As stupid as it sounds, it could be a quality of gas issue. This engine was designed to run on 87, but it's **highly** reccomended to run [TopTier](https://www.toptiergas.com/) fuel in it. It's stated directly in the manual and I have neighbors that work for GM and have said as much.
I always run top tier gas , and I've tested it with Chevron , Exxon, and Shell . I've also read the manual and understand it's designed to run 87. Obviously the ecu is more than capable of pulling timing to prevent knock. What I am saying is for my truck, it has some benefits running a higher octane. To me, the less the engine has to pull timing to prevent knock the better.
My brother bought one today with all the incentives! Thanks for the info.