Message: Hey guys im running into a problem with my 3.9L engine. I used to get 16.25mpg but in the last 7,000 miles it has gone down to 15mpg. I did a tune up on the engine 20 or 30,000 miles ago and had walmart do there fuel system fogging treatment 6,000 miles ago. I have a 1.7 rockers, intake, exhaust, V8 TB, superchips on 87 setting, and use quality oil. The engine has 120,000 miles.
Any ideas on what this could be?
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Subject: 15mpg?