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  1. Oct 8, 2023 · For the current generation (2021-present) of the Chevrolet Tahoe, the base 5.3-liter ECOTEC3 V8 engine and the 3.0-liter Duramax Diesel engine do not require premium gas. They are designed to run on a minimum of 87-grade octane gasoline.

  2. Mar 14, 2023 · Premium unleaded gasoline meeting ASTM specification D4814 with a posted octane rating of 93 — (R+M)/2 — is highly recommended for best performance and fuel economy. Unleaded gasoline with an octane rated as low as 87 can be used. Using unleaded gasoline rated below 93 octane, however, will lead to reduced acceleration and fuel economy.

  3. Jan 20, 2016 · From my point of view, if you are concerned about total fuel costs, then go with the 5.3, and save yourself some money. If you are not concerned about total fuel costs, then go with the 6.2. If you plan to tow a lot, particularly large trailers/loads, then the 6.2 makes more sense to select.

  4. Compare the 2021 GMC Sierra 1500 with the 2021 Chevrolet Silverado 1500: car rankings, scores, prices and specs.

  5. Fuel Economy of 2021 Chevrolet Vehicles. EPA MPG. Owner MPG Estimates. 2021 Chevrolet Blazer AWD 4 cyl, 2.0 L, Automatic 9-spd. Regular Gasoline. Not Available.

    Epa Mpg
    Owner Mpg Estimates
    Regular Gasoline
    Not Available How can I share my MPG?
    Combined MPG: 24 combined city/highway ...
    Not Available How can I share my MPG?
    Combined MPG: 21 combined city/highway ...
    Not Available How can I share my MPG?
    Combined MPG: 23 combined city/highway ...
    Not Available How can I share my MPG?
  6. Sep 4, 2014 · But in spite of the high compression, these motors are set up to run at 89 octane by GM. Unless you have a knocking condition, and you shouldn't, use what the manufacturer recommends unless you mess with the tune. Then use what the tech recommends.

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  8. Jun 22, 2020 · Check out the complete 2020 Chevrolet Silverado fuel economy figures, including the most, and least efficient options on offer - plus a few surprises, as well.