Gas mileage suddenly significantly lower in Hybrid

[Catrikerider]

Our hybrids lose a fair bit of fuel economy in winter. Let‘s say a 20% drop for the sake of discussion. So 42 goes down to 33-34, for example.

This is actually pretty consistent with pure ice vehicles, which also suffer due to low temps and winter blend fuel. You just notice a 20% drop from 40 more than you notice the same percentage drop from 20. If a 50 mpg Prius loses 20%, you notice that huge 10 mpg drop more than a 20mpg vehicle suddenly getting 16.

During our recent bad weather, my wife‘s hybrid Toyota went down to around 30, and it normally gets 40.

This all assumes you live somewhere that experiences a significant change in weather seasonally.

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[Deleted member 7089]

I have a block heater and plug it in under -10C (14F). I get moderately better gas mileage as all-electric kicks in much quicker and cabin seems to get warmer faster.

 

[Michael42]

My mpg goes down to the high 30's when its cold (below freezing temps)
Because you run the gas powered engine more for Heat...
I still love my 23 XL Hybrid.

 

[JetFixxxer]

We have our winter-blend gasoline on top of that we have been under 30F. I dropped from avg. 45 to 39..
https://www.gasbuddy.com/go/summer-blend-and-winter-blend-gasoline

 

[svogt302]

I dropped 3-MPG since it got frigid in Northern NJ.. Also doing alot more short trips which doesn't help.

 

[dn325ci]

I've not seen this in the replies yet, so here's another thing to consider - summer gasoline blends (by federal EPA law) are 1.7% more energy dense than winter blends so we all get less MPG in the winter, regardless of the ambient temperature. BEV and Hybrid owners suffer even more in the winter as electric vehicle batteries lose efficiency the colder it gets as well:

Winter gasoline is less energy dense

Very interesting. I knew that there were different seasonal blends but didn't know that drove a difference in energy density. 1.7% isn't the entire "winter" reason, but obviously adds to the many efficiency factors taking a hit during winter.

 

[HoiToid]

Yeah, 30+ mpg winter is still better than my '02 Ranger's 19mpg overall average;
I just wasn't aware of the cold weather's effect on a hybrid's mpg since I had not seen it mentioned anywhere on this forum or elsewhere; feel better knowing it's the "nature of the beast" and not something to get repaired. Thanks everyone

 

[Cidecar2]

My '24 Hybrid XLT with 6,000 miles on it has suddenly dropped in MPG from 43 to less than 30 in last two fillups. No changes in driving habits ( no towing ever) , only two variables I can think of are 1) cold winter weather, 2) just noticed tire PSI is around 32 even after 50 mile trip in 35 degree weather. The door sticker says 35psi Cold~~~~ can that be causing such a difference? Or does anyone have a good answer to what's causing the huge drop in MPG?
No Snarky answers please, and thank you

Do you have the climate system on auto? If so set it on manual (A/C off) set it for 74 degrees. Use the heated seats and heated wheel. Im getting 38mpg in Spokane right at the 32-34 outside temp mark.

 

[HoiToid]

No heated seats or steering wheel in my XLT;
Climate system on manual, I don't go out every day anyway, so I'll just have to wear heavier jacket and wait it out till Spring.
I did set tires to 35psi during the 25 degree chill this morning

 

[MakinDoForNow]

In Texas tire pressure is a PIB as ambient in am can vary 0- 30°F in two or three days. Plus the smaller tires heat up faster than larger tires. Not uncommon to leave in am at 35 psi have 20°F ambient temp change plus rolling heat build up and see 3-4 psi increase. Plus parked an hour will have sunny side = 1-1.5 psi difference from shady side. I consider 35 cold psi is minimum and with my battery operated Ryobi inflator over fill 1/2 lb as that seems to settle after 30 minutes to desired pressure.

 

[lewiskauffman]

I keep the heat turned off until the temp gauge starts to move up. Seems to help, except for the Mrs complaints.

 

[deanobc]

My '24 Hybrid XLT with 6,000 miles on it has suddenly dropped in MPG from 43 to less than 30 in last two fillups. No changes in driving habits ( no towing ever) , only two variables I can think of are 1) cold winter weather, 2) just noticed tire PSI is around 32 even after 50 mile trip in 35 degree weather. The door sticker says 35psi Cold~~~~ can that be causing such a difference? Or does anyone have a good answer to what's causing the huge drop in MPG?
No Snarky answers please, and thank you
[/QUOTE
Winter months always lower. I have been driving a Kia hybrid since 2019. Same issue. No need to panic. Colder weather means engine kicks in more often as you are running more accessories. Winter gas is less efficient. Do you have snow tires as this can affect mileage. Lots of variables.

 

[Hypsypops]

I'm in southern California where we're soft and our definition of cold is 50 and even then, I notice that my XLT hybrid will start the engine way more in the "winter" compare to the other 10 months out of the year. My mileage drops from 42 to 38 in the "winter". Also something to consider and I am not sure whether your state does this - CA uses a different formula of gas in the winter and it typically lowers MPG by about 10% from what I have read.

 

[npaladin2000]

I keep the heat turned off until the temp gauge starts to move up. Seems to help, except for the Mrs complaints.

Yeah, that's the big one for me too. I do have to think about whether the loss in MPGs is worth the grief from the passenger seat. Given that any money I save she's gonna spend anyway, I don't think about it much.

 

[agmonaco]

Mine dropped to 36 MPG more or less. Damn cold though and tire pressure makes a big difference if low. In the Fall I was getting more than 42MPG. I live in Pittsburgh. BTW I saw no difference using 93 Octane when compared to 87.

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