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Discussion Starter · #1 · (Edited)
Good morning. So I have seen a steady decline in my gas mileage. I use to get around 15.5 average and now Im down to 12 average. I replaced the air filter, Keep my tires at 38psi. Also the truck seems to be idling a little rough. Suggestions to whats going on and solutions? I have the 4.7. Thanks!


Mike.
 

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Rough idle is most likely spark plugs replce them with a good Iridium type.
 

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Yeah isnt the interval for the newer 4.7 30k for one bank and 45k for the other?
 

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No the interval at this on my '11 is 45 for uppers 90 for lowers and uppers according to the Owners Manual I have.

I would agree on the spark plugs.
 

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No the interval at this on my '11 is 45 for uppers 90 for lowers and uppers according to the Owners Manual I have.

I would agree on the spark plugs.
That sounds right.

OP how many miles are on the truck?
 
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