I just use 87 and it works fine for me. Sure, premium might give you a little more power and MPG, but is it really worth the extra cost on a daily driver?
Adi said:
I just use 87 and it works fine for me. Sure, premium might give you a little more power and MPG, but is it really worth the extra cost on a daily driver?
It is when you’re dealing with potential catalytic converter issues. You need to run at least mid-grade for this engine.
I’ve got a 2016 2.7 with 118,000 miles, and I always use Shell 93. It feels smoother, with more power and better gas mileage.
Remy said:
I’ve got a 2016 2.7 with 118,000 miles, and I always use Shell 93. It feels smoother, with more power and better gas mileage.
What kind of mileage do you get? I have a 2016 2.7 and I’m getting around 18mpg.
@GermanicExpert
I get about 18-19 in the city and 22-23 on the highway, but I live in New England, so the hills definitely impact that.
Remy said:
@GermanicExpert
I get about 18-19 in the city and 22-23 on the highway, but I live in New England, so the hills definitely impact that.
I might have to try 93. It’s a lot with the 36-gallon tank though.
@GermanicExpert
Try mixing 87 and 93.
@GermanicExpert
I’m getting 16.2mpg on my 2016. 
Caden said:
@GermanicExpert
I’m getting 16.2mpg on my 2016.
Are your trucks lifted? I have a 2016 2.7 and I’ve never used anything but 87. I get 21mpg combined and more on road trips.
@Toby
I installed Bilstein 5100s this year. MPG didn’t change much though. Still around 16.2, maybe 16.5 actual. Could be the 3.55 rear end.
@Toby
Nope, mine’s stock.
@GermanicExpert
Same here with my 2016.
@GermanicExpert
I’m getting about 20mpg with my 2022 2.7 Ecoboost.
Remy said:
I’ve got a 2016 2.7 with 118,000 miles, and I always use Shell 93. It feels smoother, with more power and better gas mileage.
I’ve got a 2015 2.7 with 155k miles and always use 87. No issues so far. I’ve been curious about trying premium though, just to see if there’s any noticeable difference. I average about 21.1mpg overall.
Remy said:
I’ve got a 2016 2.7 with 118,000 miles, and I always use Shell 93. It feels smoother, with more power and better gas mileage.
Placebo effect, maybe?
Just so you know, octane has nothing to do with how clean the gas is. It’s actually designed to prevent premature ignition. Back in the day, cars would sometimes keep running after you turned them off because the gas was igniting on hot cylinders without a spark. Octane made the gas harder to ignite. Modern cars have sensors to prevent this, but higher octane gas still helps prevent engine knock.
If you don’t want to pay for premium, 87 with a good detergent additive, like the gas from Costco, works great and is more cost-effective.
Thanks for the tips! I was under the impression premium would keep things cleaner, but it sounds like that’s not the case. I’ll keep running 87, but I’ll switch to higher octane when towing for a little extra power.
I’ve run 87 on my 3.5 Ecoboost for almost 200,000 miles without any issues. Anything more seems like a waste of money for everyday driving.
Terry said:
I’ve run 87 on my 3.5 Ecoboost for almost 200,000 miles without any issues. Anything more seems like a waste of money for everyday driving.
There are thousands of work trucks out there with the 2.7 running on regular gas every day without any issues. If premium was only 30-40 cents more per gallon, sure, I’d consider it. But paying an extra $25 every time I fill up? No thanks.