What type of fuel is required for a 2018 GMC Sierra?

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Kenneth thabo Jan 27, 2021

The 2018 GMC Sierra runs on regular unleaded fuel rated at 87 octane or higher. The regular cab model can store up to 28.3 gallons, while the Double and Crew Cab sizes can hold up to 24 gallons. The Sierra gets an average of 17-20 miles per gallon, with 15-18 mpg in the city and 20-24 mpg on the highway. Some vehicles require premium fuel with a rating of 97 octane or higher to ensure proper ignition. Expensive cars typically need higher compression in their combustion chambers. Using premium fuel in a truck designed for regular fuel won't enhance performance and could potentially damage the engine over time. It's best to follow the manufacturer's guidelines to keep your Sierra running smoothly.

More answers

Vanessa L. Dec 22, 2020

In 2018, a GMC Sierra 1500 pickup truck is designed to run efficiently on standard 87 octane gasoline.
Charles Warren Oct 3, 2019

It appears that for 2018 GMC Sierra trucks with the same engine size, they require the same type of fuel. Models equipped with a 5.3 liter engine, such as the Sierra crew cab 6.5FT SB, the SLT crew cab 5.8FT SB, the SLT double cab SB, the SLT crew cab 6.5FT SB, the SLE crew cab 6.5FT SB, the Denali crew cab 5.8FT SB, and the Denali crew cab 6.5FT SB, run on regular unleaded gasoline. On the other hand, the 4.3 liter engines in certain models, like the Sierra double cab SB, the Sierra regular cab SB and LB, the Sierra crew cab 5.8 SB, SLE regular cab SB and LB, the SLE double cab SB, and the SLE crew cab 5.8 SB, have the flexibility to use both E-85 and regular unleaded gas, making them Flex Fuel vehicles.
Theresa W. Jul 11, 2023

I put regular gas in my 2018 Denali before, but after checking the manual, I found out it should be using premium fuel. What should I do when it's time to refuel next?

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