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On the EPA test cycle the Envision gets better fuel mileage than the RX 350 AWD running its gasoline engine (22 city/28 hwy vs. 21 city/28 hwy).
An engine control system that can shut down some of the engine’s cylinders helps improve the Envision’s fuel efficiency. The RX doesn’t offer a system that can shut down part of the engine.
Both the Envision and the RX have a standard automatic start/stop engine feature to stop unnecessary fuel waste and pollution at stoplights and heavy traffic. All Envisions have a standard disable switch for the system, so a driver can keep the engine from shutting off when the vehicle stops temporarily. The RX 350h/500h doesn’t offer a way to disable start/stop.
To lower fuel costs and make buying fuel easier, the Buick Envision uses regular unleaded gasoline (mid-grade octane recommended for maximum performance). The RX 350 requires premium, which can cost on average about 35.1 cents more per gallon.
The Envision has 1.6 gallons more fuel capacity than the RX 450+’s standard fuel tank (16.1 vs. 14.5 gallons), for longer range between fill-ups.
The Envision has a standard cap-less fueling system. The fuel filler is automatically opened when the fuel nozzle is inserted and automatically closed when it’s removed. This eliminates the need to unscrew and replace the cap and it reduces fuel evaporation, which causes pollution. The RX doesn’t offer a cap-less fueling system.