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  Its looks might still call back to the battlefields of World War II, but there's nothing old-fashioned about the Jeep Wrangler 4xe's powertrain. [credit: Jeep ]

It is not a hard-and-fast rule, but most cars would be better with the addition of some electric motors. There are always exceptions—heavy batteries and an electric motor would ruin a Caterham 7, for instance—but it holds true for most cars. Consider the Jeep Wrangler 4xe, the new plug-in hybrid variant of the nation's favorite rock-crawler.

For non-car people, Wrangler might as well be synonymous with Jeep. The current-generation Wrangler only dates back to 2017, but it still carries plenty of styling cues that hark straight back to the original World War II Jeep. Big wheels project out from the body, protected in plastic arch extensions that house the LED daylight running lights up front.

But it's not a particularly big SUV by the standards of 2021, at 188.4 inches (4,786 mm) long (including the rear-mounted spare tire). The doors signal to you that they're removable by way of large external hinges. The only real clues that this is a plug-in hybrid are some electric blue bits here and there (like the tow hooks) plus the charging port that lives just below the A pillar on the driver's side.

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  The BMW X5 xDrive45e is a 50 mpg plug-in hybrid SUV. [credit: BMW ]

It's been a while since we spent time with BMW's plug-in hybrid X5. Since then, the German automaker replaced the X5 with an all-new model called the X5 xDrive45e. The brand has returned to its iconic inline six-cylinder engine configuration under the hood and has doubled the traction battery in capacity, usefully boosting the SUV's electric-only range.

Styling-wise, the X5 xDrive45e is similar to its non-hybrid sibling. It's a big vehicle that looks particularly tall on the road. I think it lacks the handsomeness of the original X5, but the Internet already has enough takes on BMW styling and doesn't need another one from me.

On the inside, all the materials you sit on or touch feel high-quality, and the driver's seat has good forward and rear visibility. However, I felt a little like I was sitting on the car (in an overstuffed armchair) rather than in it. Ahead of the driver is a thick-rimmed multifunction steering wheel and a 12.3-inch digital main instrument display.