My friend has a brand new Wrangler automatic, and I've driven it. I really don't think the engine is the problem, it's the aerodynamics. The gearbox keeps the revs close to 1000rpm until top gear, but the engine is working pretty hard keeping that thing going down the road. The second you let off the gas at even 35mph it feels like there's a massive parachute slowing it down, even compared to other tall SUVs and crossovers. I have never seen a car that does that before.
The new Grand Cherokee might do a bit better because they've made the body less boxy.
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