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Discussion Starter · #1 ·
Hello Elantra Forum,

Just got a hand-down 2013 Elantra 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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If you had issues with the coils, O2 sensors or PCV you'd most likely get a check engine light. Fuel & water pumps won't help with mpg.
I would check the air filter, change oil (if they're not new) and maybe jack up each corner to see if maybe the brakes are dragging. There really isn't much you can do to modern cars to gain MPG except preventative maintenance.

You could get an app call Torque and a bluetooth OBD2 reader and view different parameters of the engine but you'd have to know what you're looking at to know if it would be causing a loss of power/economy.

You didn't say what type of driving - city or highway. Mine in about a 50/50 mix shows 29.5 - 30 but hand calculates to 27-27.5.
 

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I have an Elantra GL 2011 and I have about 22-23 MPG (I read in canadian 12L/100kms). I bought it used at 184k kms. Let me know if you found a solution! I am going for a full synthetic oil change with oil filter to see if it goes better.
 

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Discussion Starter · #4 ·
If you had issues with the coils, O2 sensors or PCV you'd most likely get a check engine light. Fuel & water pumps won't help with mpg.
I would check the air filter, change oil (if they're not new) and maybe jack up each corner to see if maybe the brakes are dragging. There really isn't much you can do to modern cars to gain MPG except preventative maintenance.

You could get an app call Torque and a bluetooth OBD2 reader and view different parameters of the engine but you'd have to know what you're looking at to know if it would be causing a loss of power/economy.

You didn't say what type of driving - city or highway. Mine in about a 50/50 mix shows 29.5 - 30 but hand calculates to 27-27.5.
Hey thanks much for your post Scott,

but, you didn’t mention about the Fuel Filter.
You think Fuel Filter maintenance (replace or I may try to run some rubbing alcohol through it, may do something significant?
Thanks again.
 

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I don't know if these have an external fuel filter that can be changed. Most late model vehicles only have the 'sock' that is in tank connected to the pump assembly.
You could try a fuel cleaner like SeaFoam I suppose.
 

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First thing is to jack up (separately) each rear corner a few inches and lightly spin the respective rear wheel. The wheel should spin freely both forward and backwards. If not, this is killing your mpg. Elantras of that vintage have a problem with binding / rusting brake shoes which causes low mpg. Clean or replace brake hardware and possibly brakes. This fixed my low mpg. After I made the repair, I mentioned it to the dealer and they said this was a common problem and cleaning / lubricating rear brakes should be done once a year.
 

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Hey thanks much for your post Scott,

but, you didn’t mention about the Fuel Filter.
You think Fuel Filter maintenance (replace or I may try to run some rubbing alcohol through it, may do something significant?
Thanks again.
Fuel filter is a “sock” in the fuel tank attached to fuel pump. Check rear brakes for dragging.
 

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I have an Elantra GL 2011 and I have about 22-23 MPG (I read in canadian 12L/100kms). I bought it used at 184k kms. Let me know if you found a solution! I am going for a full synthetic oil change with oil filter to see if it goes better.
Synthetic oil may at most get you one additional mile per gallon. Check your rear brakes for dragging.
 

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Hello Elantra Forum,

Just got a hand-down 2013 Elantra 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!
Spend a few hundred and give the car a tune including the trans. fluid, from what u said sounds like ur brother didn`t. 02 sensors would be last their expensive, c what works
 

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If you had issues with the coils, O2 sensors or PCV you'd most likely get a check engine light. Fuel & water pumps won't help with mpg.
I would check the air filter, change oil (if they're not new) and maybe jack up each corner to see if maybe the brakes are dragging. There really isn't much you can do to modern cars to gain MPG except preventative maintenance.

You could get an app call Torque and a bluetooth OBD2 reader and view different parameters of the engine but you'd have to know what you're looking at to know if it would be causing a loss of power/economy.

You didn't say what type of driving - city or highway. Mine in about a 50/50 mix shows 29.5 - 30 but hand calculates to 27-27.5.
I have a 2013 Gt 1.8l Iget around 25mpg city and 30/33 hyw. I've noticed after new tires that my mpg increased a little. Also had the alignment done car drove straight no pull when braking and didn't drift but was way out call it plowing the way they were anyway got that done and small improvement I do use Torque OBD2 I paid for the pro and think its well worth the $25
 

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First thing is to jack up (separately) each rear corner a few inches and lightly spin the respective rear wheel. The wheel should spin freely both forward and backwards. If not, this is killing your mpg. Elantras of that vintage have a problem with binding / rusting brake shoes which causes low mpg. Clean or replace brake hardware and possibly brakes. This fixed my low mpg. After I made the repair, I mentioned it to the dealer and they said this was a common problem and cleaning / lubricating rear brakes should be done once a year.
I'm looking for advice on rear brakes 2013 GT replaced calipers rotors pads did this mostly because passenger side was all but gone so after replacing everything same side same issue replaced less then a yr ago. Am I missing something or possibly fudged up something?
 

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I'm looking for advice on rear brakes 2013 GT replaced calipers rotors pads did this mostly because passenger side was all but gone so after replacing everything same side same issue replaced less then a yr ago. Am I missing something or possibly fudged up something?
When corner is jacked up, does the wheel spin freely and slowly come to a stop?
 
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