Why Would My MPG Drop?

Rickster70

Rickster70

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Joined
Mar 19, 2021
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Location
Fishers, Indiana
I had all rockers replaced, values too, as well as both cam shafts, along with replacement of the spark plugs.

Why would mile milage decrease by 4 miles per gallon???
 
Check any after market setting applied with a chip or JScan and make sure it wasn't set back to factory specs.
 
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No lift, change in tire/wheel size, gearing...nothing has been done to the drive train of the vehicle? The reason I threw out the idea to begin with is a slight change in mileage would be expected to the positive, but a 4 mpg loss represents around a 20% loss and I would suggest that it is an ECU issue and not necessarily an engine issue.
Have you run a JScan or another diagnostic to see what's going on? Highly recommend it.
 
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