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Old 04-14-2016, 06:50 PM   #1
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Default Loss in Fuel Economy

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!
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Old 04-14-2016, 07:37 PM   #2
 
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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.
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Old 04-14-2016, 09:50 PM   #3
 
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Has our fuel blend around here changed from winter to summer yet?
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Old 04-14-2016, 11:22 PM   #4
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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.
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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.
AFAIK, it's the factory one but I could be wrong. Little over 50k miles. How often should these be changed?
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Old 04-15-2016, 06:18 AM   #5
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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
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Old 04-15-2016, 06:27 AM   #6
 
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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.
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Old 04-15-2016, 06:37 AM   #7
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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
How do you reset fuel trims? Is that done by replacing the O2 only?
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Old 04-15-2016, 06:39 AM   #8
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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)
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Old 04-15-2016, 08:28 AM   #9
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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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