2027 Silverado V8s Drop 1-2 MPG in New Ratings
Buyers weighing a V8-powered 2027 Silverado should compare the revised window-sticker mileage against the 2026 model before ordering.
Updated on Nov. 3, 2026 in Trucks
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General Motors published fuel economy ratings for V8-powered 2027 Chevrolet Silverado trucks showing mileage between 1 and 2 mpg lower than the 2026 models across city, highway, and combined ratings. The change applies to the 5.7-liter and 6.6-liter V8 versions of the redesigned pickup, with most 2027 diesel Silverados also returning 1 to 2 mpg worse than their 2026 counterparts.
Why it matters
For households that rely on a full-size pickup for towing, hauling, or long commutes, lower rated mileage means higher fuel costs over the life of the truck. The figures were published as production of the new-generation trucks began in October 2026, so buyers comparing 2026 and 2027 models now have the official numbers to weigh side by side.
The 5.7-liter V8 Silverado is rated 16 mpg city, 19 mpg highway, and 17 mpg combined in two-wheel drive, while the 6.6-liter V8 ZR2 drops 3 mpg on the highway compared with its prior rating. Mileage for the 2.7-liter turbocharged four-cylinder has not yet been published.
The players
General Motors
Detroit automaker that builds the Chevrolet Silverado and GMC Sierra full-size pickups, which are among the best-selling trucks in the country.
GMC Sierra
GM's premium full-size pickup line, which shares its platform and V8 engine options with the Chevrolet Silverado.
The details
GM posted the revised figures in documents that were later shared by GM Authority, covering V8 examples of the redesigned 2027 Silverado. Four-wheel-drive 5.7-liter trucks lose an additional 1 mpg on highway and combined ratings beyond the general drop. The Silverado ZR2 with the 6.6-liter V8 takes the steepest hit, losing 1 mpg in city and combined figures and 3 mpg on the highway. Buyers who want the most efficient configuration should compare the drivetrain and engine options listed in the official window stickers before ordering.
Timeline
October 2026: Production of the new-generation trucks began.
November 3, 2026: GM announced the 2027 Silverado V8 fuel economy ratings.
The Home Front
Full-size pickups remain central to household transportation in many American regions, and the mileage gap between V8 and smaller-engine trims is a recurring cost consideration in that segment. The revised 2027 Silverado ratings place V8 buyers in a position where fuel budgeting becomes more significant than it was under the 2026 numbers.
If you are shopping for a 2027 Silverado, compare the window sticker mileage for your exact engine and drivetrain against the 2026 model you are considering, and factor the difference into your annual fuel budget. If you already own a 2026 Silverado or Sierra, the 2027 figures do not change your truck, but they are useful when estimating running costs for a future purchase.
The takeaway
The lower V8 ratings are a reminder to compare official EPA window-sticker numbers for the specific trim and drivetrain you plan to buy rather than relying on the prior generation's figures. Keep a record of the sticker mileage on any truck you buy so you can track real-world fuel costs against the rated numbers over time.
Further reading
For more on how full-size pickups compare for daily use, browse our Trucks coverage.
Source note: This article includes information reported by Jalopnik.
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