We drove both the 2WD and 4WD versions of the 2006 Toyota Highlander Hybrid on a variety of roads in and around the Phoenix region. Not surprisingly, we attracted no attention from fellow motorists, as the new hybrid model looks like other Highlanders and Highlanders, as attractive as they are, look a lot like many other compact SUVs on the market today.
Like most newer hybrids, the Toyota Highlander Hybrid goes quiet at stops when the engine shuts off to conserve energy, but delivers plentiful and seamless power when it's go. Not only is there no weight penalty because of its electric drive motor generator and battery, its V6 gives performance that's closer to a V8. Toyota's throttle modulation is delivered with logic. Although there is a slight delay on start, there is a smooth delivery of torque as you gain momentum. Braking is smooth, as well, and comes by a pedal that reacts gradually at its top end, and is responsive, without being harsh. Using the "B" selection for the transmission (which adds engine braking) for quicker stops increases fuel economy, but can come at a penalty of increased engine noise and a slightly jolting feel, depending on your speed when you select it. The 4WD-i system increases launch torque (if you care about 0-60 acceleration, which is 7.3 seconds according to Toyota, or need to make a quick avoidance maneuver), and also allows four-wheel regenerative energy capture. Not a full-time system, the 4WD-i uses a rear motor that activates only when increased traction is needed. Toyota engineers report this is a seamless operation and we trust them, but the dry pavement of Phoenix did not provide us with adequate opportunity to evaluate its competency, although we always felt sure-footed, even applying full power on take-offs and carving tight corners at speed.
Pushing the throttle hard in both versions brought engine noise to the interior, but we remembered that gentle application of the accelerator improves fuel economy. The Highlander Hybrid's electric rack-and-pinion steering was impressive and fast-reacting, weighted for predictable control. Computer electronics ordain precise handling, similar to the Audi A4's wonderfully-weighted turn-in, but somewhat lighter in your hands, like the Honda Pilot's tight and smooth steering. (Interestingly, the electric steering's ECU orders up steering boost based on your speed and communication with the vehicle's stability system)
The impressive array of electronics includes ABS, TRAC (traction control system that helps avoid unnecessary wheel spin); Vehicle Stability Control (VSC - for additional intervention and support when in a skidding situation); and Vehicle Dynamics Integrated Management (VDIM - which provides integration of all other traction and control systems).
Notably, the optional 4WD is not a full-time system, engaging only when needed and designed for "on-road enhancement," not for off-pavement use. When asked, Toyota engineers claimed that the wheel spin that comes with slippage on dirt, sand and other backcountry surfaces can interfere with the electronics of this hybrid model. This is different from the Ford Escape Hybrid, which Ford claims has backcountry capability.
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