
The short answer is no, the TX and Grand Highlander are two different vehicles. With Lexus and Toyota being owned by the same parent company, similarities do exist. Overall size, similar engines, and passenger capacities make it an interesting question; however, the similarities stop there. The TX offers a more sophisticated interior, including better materials and more technology. The overall aesthetic of the TX is more dynamic than that of the Grand Highlander. Finally, the performance is better in the TX with upgrades to handling and sound dampening for a smoother and quieter ride.
It is highly recommended to use Premium 91-octane gas on the Lexus TX. Lower-graded gas can cause the TX performance to drop, including worse gas mileage and the potential for engine knocking.
The TX offers captain's chairs as an optional package upgrade for the premium trim level and high. These are only offered with heating and ventilation features.
The Lexus TX's fuel tank capacity varies depending on which model you choose. The TX 350 has a 17.8-gallon tank. The TX 500h comes with a slightly smaller tank at 17.1 gallons. The TX 550+ comes with a much smaller 14.5-gallon tank but makes up for the discrepancy by having the best gas mileage.
The TX is not a minivan, although it is the largest vehicle offered by Lexus. If you are currently considering a minivan, the TX may still fit your needs for passenger and cargo space with up to 7 passengers and 20.2 cubic feet of storage behind the 3rd row.