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What cause below normal MAP sensor readings?

(2001 Jeep Cherokee)
in Troy, AL on September 12, 2011
130,000 miles, 4.0L motor. Engine runs good. Have checked MAP operations, good. TPS-good, O/2 sensor, all four are new and good. IAT-good. Coolant temp senor good. No DTC. Using to much gas. Could their be a restriction in the exhaust sytem causing this????????????
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