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Hello Elantra GT friends, I have a 2020 N-Line that I've had since 11/2020. I've noticed as of late that my gas mileage is not the best. I'm a bit of stop-and-go traffic and have my a/c going on high all summer. Just wanted to see if anyone has had this issue and has any recommendations to improve my gas mileage. Thanks!
 

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Hello Elantra GT friends, I have a 2020 N-Line that I've had since 11/2020. I've noticed as of late that my gas mileage is not the best. I'm a bit of stop-and-go traffic and have my a/c going on high all summer. Just wanted to see if anyone has had this issue and has any recommendations to improve my gas mileage. Thanks!
What mileage are you getting, and what is your average speed?
For reference, my average summer mpg is around 32 for local driving which is not stop and go but the average speed is around 35. This is as recorded by the car and not actually calculated from fill up to fill up. I don't know how accurate the readings in the car are.
 

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Discussion Starter · #3 ·
What mileage are you getting, and what is your average speed?
For reference, my average summer mpg is around 32 for local driving which is not stop and go but the average speed is around 35. This is as recorded by the car and not actually calculated from fill up to fill up. I don't know how accurate the readings in the car are.
What mileage are you getting, and what is your average speed?
For reference, my average summer mpg is around 32 for local driving which is not stop and go but the average speed is around 35. This is as recorded by the car and not actually calculated from fill up to fill up. I don't know how accurate the readings in the car are.
Hi ron-n thank you for your response. I usually measure it by the miles I've traveled with the miles to empty number. I'm sure that's not the best way to gauge it. I'm not sure how to check my MPG. Is there a setting so I can measure it? Thanks again
 

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Best way to manually calculate MPG is write down the miles on your odometer next time you fill up; then, next time you get gas after that, fill your tank, write down the miles again, and how many gallons it took to fill it. To actually get the number, subtract the second mileage from the first, then divide that number by the amount of gallons of fuel. For example, 61322 - 60938 = 384 miles. 384mi ÷ 11.03gal = 34.81 miles per gallon.
 

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You might try a fuel system cleaning gasoline additive. My service rep suggested a Hyundai-approved fuel additive ($35) and oil treatment ($18) at my last oil change. Like an idiot, I allowed him to do it without first researching the products. I won't be doing that again! It made my drive train run noticeably worse and lowered my MPG, to boot.

I waited 3,000 miles (about 6 weeks for me) and then put in my trusty Gumout Regane Complete Fuel System Cleaner (about $6 per bottle, Google it) and it cleared up the entire problem, restored giddy-up and returned my MPG to 34.8.

Good luck,
-zed

P.S.,
Weird that my MPG and Wickednoreaster's are the same, huh?
 

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i been trying to track down the fuel consumption problem myself. My gt nline was getting like maybe 300km a tank so far a large portion of my problem has been injectors being clogged causing massive oil dilution and the high pressure fuel pump. Comman symptoms of these being the issue is alot of backfireing when you tap the gas or your car struggles to start in the morning. also rising oil levels
 
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