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Jason - You described 2 totally different things. An exhaust brake is an exhaust restrictor, and simply makes a mild hissing noise. A Jake brake (the loud type) provides more braking, but it does it by opening the exhaust valve to decompress the cylinders at the top of the compression stroke. Far more internally complex.
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Call me crazy, but I actually try for mpg with this Jeep:
Typical driving: Back in Rochester for school, driving is 60 - 70% city
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