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The only practical and cheap way to realize true fuel economy in the Jeep Liberty is to keep your speed below 70mph. I've been driving this vehicle for 5 years, and I've noticed an increase of at least 4-5mpg by keeping the speed on the highway below 70mph. This is not a fuel efficient vehicle, and its aerodynamics are about the same as a brick, so fuel mileage suffers accordingly.

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Q: Jeep Liberty 3.7 what are honest opinions about Jet Performance Chip or equivalent does it improve horse power economy etc?
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