Loss in Fuel Economy

The Italian

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I have a 2013 Focus that was averaging around 34-35MPG at about 320 miles to a tank. But lately, I've noticed it dipped down to about 30MPG and my last fil-up was under 300 miles. Whats causing this? Fuel system need cleaning, need new fuel filter, does the air filter have any effect?

Help me get my miles back!
 

P40E

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How many miles on the air filter ? Also check to make sure your tire psi is at spec. .

I don't think my tpms sensors triggered the low psi light on the dash till my psi got down to about 22 psi.
 

The Italian

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Has our fuel blend around here changed from winter to summer yet?
That's another thing I was thinking. Not sure if we've changed yet but I'll find out tomorrow.
How many miles on the air filter ? Also check to make sure your tire psi is at spec. .

I don't think my tpms sensors triggered the low psi light on the dash till my psi got down to about 22 psi.
AFAIK, it's the factory one but I could be wrong. Little over 50k miles. How often should these be changed?
 

Turbocharged400sbc

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you're also fairly close to the end of your oxygen sensor life. I would start with cleaning your mass airflow sensor and replacing the air filter along with resetting fuel trims
 

AWDCD3

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You also are probably due for a fuel system cleaning. Direct injection engines get a lot of gunk on the valves that will lower your MPGs.
 

wolfe

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You also are probably due for a fuel system cleaning. Direct injection engines get a lot of gunk on the valves that will lower your MPGs.
I was told, and have done this, to run injector cleaner with every oil change. And this was on a non DI engine. (GM that are know for fuel problems)
 

The Italian

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Thanks for the help guys. Will look into doing all of the above and hopefully it'll help. Need all the MPGs I can get with having a 43mi each way commute.
 

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