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An engine control system that can shut down some of the engine’s cylinders helps improve the Tahoe V8’s fuel efficiency. The GX doesn’t offer a system that can shut down part of the engine.
In heavy traffic or at stoplights the Tahoe’s engine automatically turns off when the vehicle is stopped, saving fuel and reducing pollution. The engine is automatically restarted when the driver gets ready to move again. If the conditions warrant or the driver wishes, the system can be manually disabled at any time for the duration of a trip. The GX doesn’t offer an automatic engine start/stop system.
To lower fuel costs and make buying fuel easier, the Chevrolet Tahoe uses regular unleaded gasoline (premium recommended with the 6.2 V8 engine for maximum performance). The GX requires premium, which can cost on average about 84.9 cents more per gallon.
The Tahoe has 2.9 gallons more fuel capacity than the GX (24 vs. 21.1 gallons), for longer range between fill-ups.
The Tahoe 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 GX doesn’t offer a cap-less fueling system.