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Miles Per Gal With Heat On Loss

jerr529

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jerr529 Enthusiast

jerr529

Posted
Posted

Just wondering how many MPG you loss with your truck when winter arrives,and have the Heat on I seem to have loss about 2 miles a gal maybe cause im warming up longer and the truck is cold so its the reason maybe?? any opinions/

jerry

dlstewart01 Senior Enthusiast

dlstewart01

Posted
Posted
Just wondering how many MPG you loss with your truck when winter arrives,and have the Heat on I seem to have loss about 2 miles a gal maybe cause im warming up longer and the truck is cold so its the reason maybe?? any opinions/

jerry

 

Winter blend gas gets less miles per gallon.

 

Don

pennzoil29 Senior Enthusiast

pennzoil29

Posted
Posted

I lose any where between 2 to 3 mpg, if not more during the winter. I put the blame on the winter/mix gasoline.

peteking Enthusiast

peteking

Posted
Posted
I lose any where between 2 to 3 mpg, if not more during the winter. I put the blame on the winter/mix gasoline.

 

+1. Mine does the same thing.

gvbhunt Enthusiast

gvbhunt

Posted
Posted

If by heat you mean the defroster, that will make some difference. When it is on it runs the AC compressor down to about 40 degrees or so. But I also agree with everyone else. Winter blended gas drops mileage and so does the cold more dense air.

superjim Senior Enthusiast

superjim

Posted
Posted

PART of the reason is the winter blend fuel.

 

PART of the reason is ... the computer keeps the engine in OPEN LOOP longer because it takes longer for the engine to warm up to operating temperature.

 

When it reaches normal temp... it goes into CLOSED LOOP.

 

When in OPEN LOOP... the engine runs with a richer mixture to improve cold weather driveability.

 

When it goes into CLOSED LOOP... it leans out to normal.

fbachman Senior Enthusiast

fbachman

Posted
Posted

what everyone said:

 

winter blend gas + longer choke cycles + colder air, in general.... more mass of air per volume of charge due to colder Temps, thus more fuel to maintain desired air-fuel ratio.

 

Mine drops 2-3 mpg in the cold winter months...

VMax2007 Senior Enthusiast

VMax2007

Posted
Posted
PART of the reason is the winter blend fuel.

 

PART of the reason is ... the computer keeps the engine in OPEN LOOP longer because it takes longer for the engine to warm up to operating temperature.

 

When it reaches normal temp... it goes into CLOSED LOOP.

 

When in OPEN LOOP... the engine runs with a richer mixture to improve cold weather driveability.

 

When it goes into CLOSED LOOP... it leans out to normal.

 

Jim,

 

I MUST say, your POSTS are the MOST entertaining to read of ANYONE'S. I find myself yelling in MY HEAD everytime I read one of the BOLDED/CAPITALIZED words.

 

:dunno::crackup::crackup:

jrrod2004 Senior Enthusiast

jrrod2004

Posted
Posted

haha, that is all true, except i have not noticed. with the exception of today, the temp has not really dropped below 45 degrees overnight. I have not noticed any real change in MPGs with the exception of running the truck in tow/haul mode (keeping the engine at 2000 @ 55MPH.

nubuilder Enthusiast

nubuilder

Posted
Posted

I think it has to do with using the defroster (running the A/C compressor), winter gas mix, and letting the vehicle idle on startup to warm up.

Also, spinning the tires makes it drop and when it gets colder, the air pressure in the tires goes down (air takes up less space when cold vs warm).

I have a '98 Silverado Z71 with 350cu and have gone from 14 to 11.5mpg,

redvett Senior Enthusiast

redvett

Posted
Posted

Colder air temps causes the PCM to add more fuel to keep the engine at the 14.3 A/F mixture. My data shows the colder the weather the lower the fuel economy. My truck is parked in a garage heated to 60F and as soon as i drive down the road in cold weather like right now the average goes down as the temp goes down.

Bish Senior Enthusiast

Bish

Posted
Posted
stupid qustion, does it matter regarding octane levels and winter mix???

 

Shouldn't matter. I ran 87 on my 01 Tahoe and saw the same 2mpg drop as I do with 91 on my Denali. Also, not all areas switch to winter blend. Chicagoland is right up there with California as far as "special blends" go.

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