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Try the 02 sensor then if it doesn't improve the mileage pull the cat and inspect it for blockage. Mine did 20 highway but that was the best mileage it got and it was all highway, over 800 miles worth in less than 24 hours at 65-70. Mine had the 5 speed and a 2.73 rear ratio. I didn't even realize it was in 4th gear for 10 miles coming back at night.
regards
Mech
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