As the only SUV with a hybrid-drive option available for sale, the Lexus RX 400h could be extremely well-positioned to capitalise on increasing petrol prices. The current model has not seen tremendous sales since the recent price spike, however this is likely due to its steep initial cost and more focus on the comparable V6 model. The next-generation model, and its hybrid drivetrain, will be essential in cementing Lexus’ technological lead over the competition and staying ahead of increasing oil prices.

The new RX SUV, caught testing in moderate camouflage, reveals its design inspiration is drawn largely from the LF-Xh concept car shown at the Tokyo Motor Show last October. The SUV’s distinctive profile can clearly be seen as can some of the details of the new head and taillights. Key features include the waterfall-style front grille and angular headlights plus a smoother overall shape than the current car. The new RX is also expected to be slightly larger than the current model, and there could be a new seven-seater model with three-row seating added to the lineup.

Lexus has tried to differentiate its current RX 400h hybrid SUV from the petrol model, adding upgrades to the head and taillights, plus installing unique door sills and badging - all with blue-coloured accents so that passers-by will know the car is a hybrid. That tactic is also likely to carry over into the new model.

Hybrid drive to share billing with petrol units
The base model will retain the familiar 3.0-litre V6 engine but a new V8 model could also be added, running against the current trend of downsizing engines for efficiency but still important for new markets such as Russia and China. The new range will also pick up a six-speed automatic as standard in place of the outgoing model’s five-cog unit.

The hybrid model isn't expected to make its debut until one year after the new RX goes on sale. It will feature a V6 engine mated to an electric motor and is expected to develop close to 300kW. The current hybrid drive unit produces 155kW from its 3.3-litre petrol engine and 200kW from its electric motor.

Mild hybrid means mild fuel savings
These figures indicate Lexus is continuing with its practice of placing mild hybrid designs in its luxury vehicles, with only minor fuel savings as a result. When the added expense of the hybrid drive unit and some additional features - nearly $20,000 over the price of the comparable 3.5-litre V6-powered RX 350 - is taken into account, the fuel savings of just 3.1L/100km are minimal.

Next-generation Lexus RX SUV spy shots

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