Oddly enough, the hybrid actually gets worse fuel economy on the highway than its V8-powered sibling.

Bentley Bentayga Hybrid Gets Lower MPG Than Non-Hybrid | HotCars
Very few people who shell out hundreds of thousands of dollars to purchase a Ferrari or Lamborghini seem to be overly concerned about the fuel economy their supercar might manage in town or on the highway. And yet, the LaFerrari uses a hybrid-electric system to complement the internal-combustion V12, which does help with the MPG ratings as well as augmenting performance.
The world of high-end SUVs has exploded in recent years alongside the supercar market, with brands like Rolls-Royce, Bentley, and Lamborghini getting into the mix with seven-figure family haulers packed with luxury amenities and massive powertrains. In an effort to tame the Bentayga’s gas-guzzling, given that the first iteration featured a mammoth twin-turbocharged W12 engine, Bentley has released a hybrid version. Oddly enough, the hybrid actually gets worse fuel economy on the highway than its V8-powered sibling.
Bentley Bentayga Hybrid Gets Lower MPG Than Non-Hybrid | HotCars
EPA Ratings

The new Bentayga Hybrid uses a plug-in system to provide up to 18 miles of electric range. When paired to the model’s turbocharged 3.0-liter V6, the entire package combines for a rating of 45 MPGe. However, once the battery is depleted, the internal combustion engine just doesn’t seem powerful enough to push the Bentayga down the road at speed, earning a rating of just 21 MPG. The gas-powered V8 model, meanwhile, manages a rating of 23 MPG on the highway at all times.
Bentley Bentayga Hybrid Gets Lower MPG Than Non-Hybrid | HotCars
The Tradeoff

Bentley Bentayga Hybrid Gets Lower MPG Than Non-Hybrid | HotCars
For context, the V8 engine produces 100 more horsepower and gets a rating of 17 combined MPG, thanks to achieving only 14 MPG in the city. The hybrid, meanwhile, manages 17 MPG in the city with the battery depleted, for a combined rating of 19 MPG. For buyers who still can’t live without the grunt of a twin-turbocharged W12, fuel economy can’t be a major concern given that the range-topping powerplant gets 12 MPG in the city and 17 on the highway, for a combined rating of 14 MPG—all despite having the ability to fully bypass six cylinders.
Article Credit: Torstein Salvesen Full Article: https://www.hotcars.com/bentley-bentayga-hybrid-lower-mpg-non-hybrid/