K5 Blazer Forums  
Home of the K5 Blazer/Jimmy including GM Trucks and Suburbans.  
Go Back   CK5 Forums > General Discussion > The Garage

Remove these ads.

Thread Tools Display Modes
Old 12-14-2005, 11:16 PM   #1
Join Date: May 2002
Location: Broken Arrow, Oklahoma
Posts: 620

i Trader: (1 )

How much gas do you burn at idle??

well my roommate was complaining about burning gas while sitting in a parking lot letting his grand cherokee idle. of course, i was appalled at such an over-reaction considering what we all drive, but it got me thinkin. i wonder how much gas we burn when our trucks are just sitting and idling?? i was particular curious from a cold start cuz i start my truck up and let it heat up a long time in the winter. anyone ever done this? anyone have a lot of free time and want to do this? let me know what ya'll think, or know.. thanks...
XHitman396 is offline   Reply With Quote

Remove these ads.
Old 12-14-2005, 11:47 PM   #2
CK5 Vendor
38377k5's Avatar
Join Date: Sep 2004
Location: Glenwood Springs, CO
Posts: 9,756

i Trader: (8 )

GM of the month Winner
'Bout a gallon an hour.

Resident Offroad Design rep

38377k5 is offline   Reply With Quote
Old 12-14-2005, 11:59 PM   #3
Supporting Member
diesel4me's Avatar
Join Date: Jul 2003
Location: Massachussetts
Posts: 14,944

i Trader: (0 )

Exclamation here you go--

I read somewhere the average V8 motor uses between 1 to 2 gallons an hour idling.(some book I read about geting maximum MPG's)...naturally smaller engines will consume less,and EFI will not use as much as a carbed motor,mostly because they don't use a choke,and atomize the fuel more effeciently,especially when cold,when a carb is at a disadvantage..

At any rate,it IS a waste of fuel if the motor is running,and the vehicle isn't moving..unless you'll die of frostbite on a night like tonight is here (5 degrees!)..I hate being stuck in traffic jams or at red lights..I can see the $$$$ signs on the gas pump spinning while I'm going nowhere!.

I often run my vehicles out of gas if they are just going to sit..I'll dump in a gallon of gas and start them up once in a while to keep the battery charged and the motor free..I can run my 307 in the van about 20-30 minutes on a gallon of gas if its cool out..a bit longer in the summer..

I had a 454 in a 74 C10 years ago..that thing would only run about 10-15 minutes on a gallon of gas.. ..those Holley carbs are toilets!..another I had with a Q-jet wasn't much better..the choke wastes a lot of gas..especially automatic chokes that usually stay closed longer than nessasary..

Some newer vehicles must not use too much..I heard about a Jeep Cherokee in a neighbors yard last winter ,that had a remote starter,and guys plowing the parking lot in the Toyota dealership unknowingly started the jeep up too,when they hit the remote starter on a used Ford Escort they had to move in order to plow(must have been on the same "frequency!")..it ran all night and until 3pm the next day,until someone at the apartment called the cops to complain it had been running since 1 am the night before!..and it still had about 1/4 of a tank left...

My diesel VW Jetta would go 600+ miles on a tank of 14 gallons..so that thing would probably have run a week or more if it had a full tank,and I forgot to shut it off!... ..wish I kept that car...
82 K2500 GMC stepside 6.2 diesel,
TH-400,NP-208,14 bolt SF/corp.10bolt,7.5' fisher plow- --rusting away fast though.

81 G10 van 73 307 V8 th350/MV4 2.73 10 bolt..

95 FORD Countour!..my first ford ever,after 30 years of driving! --a gift from the queen of bluegrass Rhonda Vincent!
(SOLD IT ..11/30/13..)

Latest addition--1985 K-10 Suburban,6.2 diesel,700R4,3.73's,12 bolt rear..still awaiting repairs and to be registered..
diesel4me is offline   Reply With Quote
Old 12-15-2005, 12:20 AM
Posted in reply to diesel4me's post "here you go--"
Join Date: May 2003
Location: Wayne County, Ohio
Posts: 1,115

i Trader: (0 )

I know on my DD car (88 lesabre) my winter mileage definitely takes a hit if I let it warm up alot. I don't do it as much, only usually when the temp drops below 0 overnight and this is assuming I wake up on time and have minutes to waste on such frivolities, lol.
atho is offline   Reply With Quote
Old 12-15-2005, 06:04 AM   #5
Supporting Member
73k5blazer's Avatar
Join Date: Dec 2001
Location: The Rustbelt
Posts: 4,870

i Trader: (1 )

My '04 GTO's mileage gague switchs from miles/gallon to gallons per hour at idle or very very low speeds. LS1 engine. Reads 0.7-0.8 gallons/hour when warm. Reads about 1.1gal/hour when you first start it up on a cold day.
1973 K5 Blazer In progress All Glass body, Completley Line-X'd, SM465/NP205, 14bff-Detroit, 44-ARB'd, RamJet 350
73k5blazer is offline   Reply With Quote
Old 12-15-2005, 10:37 AM
Posted in reply to 73k5blazer's post starting "My '04 GTO's mileage gague switchs from..."
Supporting Member
Join Date: Feb 2000
Location: Ohio
Posts: 4,611

i Trader: (1 )

I let my '03 2500HD warm up for about 20 minutes in the morning when it's really cold (mainly because I have to take the baby to the sitter's house), and really don't see any appreciable decrease in mileage. Based on 1 gallon/hour that seems to be in the ballpark as it's only about 1.7 gallons per week.

With that said my 6.2 diesel much do much better. On a previous trailride I had the engine running non-stop for at least 8-9 hours, which included covering quite a few miles of trails and hillclimbs, and used less then 7 gallons total.
6.2Blazer is offline   Reply With Quote
Old 12-15-2005, 03:53 PM   #7
Supporting Member
dyeager535's Avatar
Join Date: Dec 2000
Location: Roy WA
Posts: 25,687

i Trader: (6 )

Fuel economy is 0MPG while sitting/idling. Best way I've seen to hit home that it's wasteful to just let a vehicle run for no reason.
web page
parts for sale
Link to "square body" manuals http://67-72chevytrucks.com/vboard/s...d.php?t=545416
"1985" K5: Vortec Headed Roller 355/MAF TPI/32 spline 465/205/10B-14SF/3.42's/33". Will be converted to MAP TPI in the future.

1987 K5: 350/TBI/700R4/208/10B F/R/3.73's/31" Someday will assimilate the "1985" drivetrain.

The answer to your carburetor problem is fuel injection.
dyeager535 is offline   Reply With Quote
Old 12-15-2005, 06:12 PM
Posted in reply to dyeager535's post starting "Fuel economy is 0MPG while..."
Supporting Member
y5mgisi's Avatar
Join Date: Aug 2002
Location: Portland Oregon
Posts: 16,553

i Trader: (0 )

Isnt it a good idea though to let the motor warm up so your not being hard on it while its cold, and things are "out of spec" do to metal expanding with heat and visa versa?
"Sometimes with respect comes that little bit of fear."
"I will take this pry bar and slap you across the face."-pinsco63
2012 GMC Sierra SLT 1500 5.3 4x4.
90 Chevy suburban/5.3swap/400/241/10blt/14bltsf.
77 Chevy Crew Cab Silverado. 396/th400. In work.
y5mgisi is offline   Reply With Quote
Old 12-15-2005, 09:06 PM
Posted in reply to y5mgisi's post starting "Isnt it a good idea though to let the..."
Join Date: Nov 2000
Location: NYC, NY, USA
Posts: 3,195

i Trader: (0 )

they say that you dont need to let the engine "warm up". On the diesels, a little longer, pretty much as soon as it drops out of high idle. (i've had this as long as 5 min though).

others have commented that you need only start the car, wait until you get oil pressure, then slowly drive away.

Anyways, all the general consensus either way is to; A start, B. let oil circulate, C. keep revs low until the engine has warmed up.

Let me tell you, it sure pisses people off behind you when your cruising at 5-10mph in the rush hour morning!
Pookster is offline   Reply With Quote
Old 12-15-2005, 09:17 PM
Posted in reply to Pookster's post starting "they say that you dont need to let the..."
sheoldeblaze's Avatar
Join Date: Aug 2003
Location: Belgrade, Montana
Posts: 1,072

i Trader: (1 )

well on my blazer, when i start it up in the morning, and let it warm up. I can litterally watch the gas guage move.
sheoldeblaze is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT -7. The time now is 09:53 AM.

Powered by vBulletin® Version 3.8.1
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.