We have a new 2023 Elantra Hybrid. We got the car in August it got great gas mileage 48-50 MPG. It’s been steadily decreasing in the last few months, the cumulative is down to 41.6. On a daily basis, even in excellent driving conditions, averaging 50MPH with few lights I. Lucky to get 40MPG. Hyundai doesn’t see a problem. Anyone else have this problem?

 

Many things can affect gas mileage among them is;

Outside temp, tire pressure , how much stuff is in the trunk, driver habits and don't forget there is a difference between winter fuel and summer fuel.

It might be a good idea to keep tract all winter and watch what happens once warmer weather comes around.

 

The car has a feature that gives you daily MPG, next week here in downstate NY, it’s supposed to be mid to upper fifty’s I’ll see if we have any improvement.
thanks for the advice

 

Same here - 2023 Elantra hybrid, bought it in November, started getting approx. 50mpg and now down to approx. 40mpg. I have heard that ambient temperature affects hybrids pretty significantly, so I'll wait until the spring to see what happens.

 

I’m curious, where are you located?Im in downstate NY so it doesn’t get freezing, today was mid 50’s and I averaged 40MPG with real local stop and go kind of stuff so I can’t complain to much

 

I'm in central NJ.

 

If you are near the coast it is somewhat warmer, but if you are closer to the western part, it can be somewhat cooler there. Middlesex, Mercer or Monmouth county ?

 

Temperatures are up in the 50's now, and gas mileage is back to approx. 51 mpg.

 

When i owned my other Hybrids( 2 different Prius), I noticed the same thing. best MPG was in warmer weather, worst was in cold weather.

 

My son has a 2022 RAV4 Hybrid and his is the same way,,
Because you are using heat the Motor has to run to heat the radiator like a gas car