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Hello Elantra Forum,

Just got a hand-down 2013 Elantra GLS 80k miles from brother.
Seems the mpg is lower than expected.

When I first got the car, I was getting on average ~22mpgs on display.
Changed the spark plugs to some nicer NGK Iridiums @ ~$10 a pop, car runs smoother, but I only seen about a +1mpg increase @ ~23mpgs now.

I don't believe my brother ever did anything to the car as far tune-ups go.
Anything I could do to make this car run better?

Fuel Filter? (hard to find it without the whole pump)
Wires? I did not see the traditional spark plug wires that I had on my Toyotas
Ignition Coils?
Water Pump?
Fuel Pump?
O2 Sensors? I've heard someone say that the smallest errors in the o2 sensors will illicit a CEL, so do these not need to be replaced?
PCV valve?

I have no CEL lights on, but should any of these items be replaced @ 80k miles or am I better leaving these be.
I've looked through the manual and did not recall it saying to Replace much of anything besides engine oil/filter and air filters.

Also, should I drain/fill the ATF? Will Maxlife work??

Thanks for any info fellas, I have limited mechanical experience and am new to the Hyundai World, any input appreciated,

Cheers!
 

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Check tire pressure and wheel alignment.
Check for a dragging brake. Cruise a few miles with minimal brake use. Then stop and feel for a hot wheel.
Replace thermostat. Cool engine burns extra gas. I do it every 10 years as maintenance.
 
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Fyi, My 2013 gets about 28mpg with just small trip city driving. On a long highway trip I can get 38 to 40 mpg. I agree to check the rear brakes. They can be problematic. Good tires may make a difference also. I have done just engine fluids since 2013 and brakes and tires and have had little change to mileage since new. 65000 miles on car now. Maybe it would be worth paying a dealer to run an engine diag checkup on the computer. Dont get trapped spending too much. They will probably push some expensive fuel system flushes and cleaning. There has been a couple of firmware upgrades but not around fuel usage. Let us know what you find out
 
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