Go Back   EcoModder Forum > EcoModding > General Efficiency Discussion
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 03-05-2018, 06:43 AM   #1 (permalink)
EcoModding Lurker
 
Join Date: Oct 2017
Location: Virgina
Posts: 19
Thanks: 3
Thanked 1 Time in 1 Post
Fill fuel in the coolest hour

They say fill fuel in the coolest hour? Why and How it improves /impacts the car?

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 03-05-2018, 07:01 AM   #2 (permalink)
Master EcoModder
 
Join Date: May 2012
Location: Tampa, FL
Posts: 1,745

Volt, gas only - '12 Chevrolet Volt Premium
90 day: 38.02 mpg (US)

Volt, electric only - '12 Chevrolet Volt Premium
90 day: 132.26 mpg (US)

Yukon Denali Hybrid - '12 GMC Yukon Denali Hybrid
90 day: 21.48 mpg (US)
Thanks: 206
Thanked 420 Times in 302 Posts
Negligible difference at best. Much like when people say their car is special and gets it's best mileage at 9 million mph.

The idea is the fuel is more dense and so you get more energy per gallon being paid for. The problem is that liquids don't change volume much due to temperature. There is far more variability/inaccuracy in the meter on the pump.
__________________




  Reply With Quote
Old 03-05-2018, 07:20 AM   #3 (permalink)
Master EcoWalker
 
RedDevil's Avatar
 
Join Date: Dec 2012
Location: Nieuwegein, the Netherlands
Posts: 3,998

Red Devil - '11 Honda Insight Elegance
Team Honda
90 day: 47.72 mpg (US)
Thanks: 1,711
Thanked 2,245 Times in 1,454 Posts
While the difference is small, it is not entirely negligible.

https://www.quora.com/How-much-more-dense-is-gasoline-in-50-degree-F-weather-than-it-is-in-80-degree-weather


Seems like 1% for every 8 degrees Celsius.
At least there's some compensation for winter gas being less dense.

Looking up the prices at https://www.eia.gov/petroleum/gasdiesel/ $2.50 seems average in most states.
Let's say with ten gallon at $2.50 a gallon then a hot summer afternoon or chilly morning at 16 degrees less could make a 50 cent difference for the same fuel.
Or get you 0.2 gallon extra for free; that's 12 whole miles at 60 mpg...

When it is cold and you don't plan on driving much after fillup, don't brim it to the neck; it might spill when it expands.

Here in the Netherlands gas goes for €1.66 a liter, that would be about $7.50 a gallon... But most of our filling stations have underground gas tanks and therefore hardly any temperature variation.
__________________
2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
lifetime FE over 0.2 Gmeter or 0.13 Mmile.


For confirmation go to people just like you.
For education go to people unlike yourself.

Last edited by RedDevil; 03-05-2018 at 07:31 AM..
  Reply With Quote
The Following 3 Users Say Thank You to RedDevil For This Useful Post:
Hilton (03-05-2018), niky (03-06-2018), UltArc (03-06-2018)
Old 03-05-2018, 07:44 AM   #4 (permalink)
Rat Racer
 
Fat Charlie's Avatar
 
Join Date: May 2011
Location: Route 16
Posts: 4,150

Al the Third, year four - '13 Honda Fit Base
Team Honda
90 day: 42.9 mpg (US)
Thanks: 1,784
Thanked 1,922 Times in 1,246 Posts
Since the gas station's tanks are likely underground, the weather at the moment won't affect the volume until it's already passed through the pump's meter.
__________________

Quote:
Originally Posted by sheepdog44 View Post
Transmission type Efficiency
Manual neutral engine off.100% @MPG <----- Fun Fact.
Manual 1:1 gear ratio .......98%
CVT belt ............................88%
Automatic .........................86%

  Reply With Quote
The Following 3 Users Say Thank You to Fat Charlie For This Useful Post:
redpoint5 (03-05-2018), samwichse (03-05-2018), Xist (03-07-2018)
Old 03-05-2018, 08:03 AM   #5 (permalink)
Master EcoModder
 
Join Date: May 2012
Location: Tampa, FL
Posts: 1,745

Volt, gas only - '12 Chevrolet Volt Premium
90 day: 38.02 mpg (US)

Volt, electric only - '12 Chevrolet Volt Premium
90 day: 132.26 mpg (US)

Yukon Denali Hybrid - '12 GMC Yukon Denali Hybrid
90 day: 21.48 mpg (US)
Thanks: 206
Thanked 420 Times in 302 Posts
Quote:
Originally Posted by Fat Charlie View Post
Since the gas station's tanks are likely underground, the weather at the moment won't affect the volume until it's already passed through the pump's meter.
If you're referring to my statement about the meter, then I will ask; how accurate do you think the meter is?

If there is such a difference in volume depending on temperature, wouldn't the retailer use temperature correction when metering? (I don't know what answer)
__________________




  Reply With Quote
Old 03-05-2018, 09:23 AM   #6 (permalink)
Master EcoModder
 
Join Date: Jan 2011
Location: na
Posts: 1,025
Thanks: 277
Thanked 218 Times in 185 Posts
I got 50+ mpg for a long time with one pump. Deleted most of those fills. Thought a co-worker was messing with me at first. Then he started using that pump to.

It was only one fuel on a pump with 4 that gave bonus. I'm guess the inspector doesn't check every fuel at every pump.
  Reply With Quote
Old 03-05-2018, 10:13 AM   #7 (permalink)
...beats walking...
 
Join Date: Jul 2009
Location: .
Posts: 6,190
Thanks: 179
Thanked 1,525 Times in 1,126 Posts
Around the world airplane's filled their tanks with COLD fuel becasue it was DENSER (more fuel per voulume), so that later when it warmed and expanded they had more fuel to burn:

Ala' -- 11 pounds of fuel in a 10 pound bag!
  Reply With Quote
Old 03-05-2018, 10:22 AM   #8 (permalink)
Moderator
 
Vman455's Avatar
 
Join Date: Feb 2012
Location: Urbana, IL
Posts: 1,935

Pope Pious the Prius - '13 Toyota Prius Two
Team Toyota
SUV
90 day: 51.62 mpg (US)

Tycho the Truck - '91 Toyota Pickup DLX 4WD
90 day: 22.22 mpg (US)
Thanks: 198
Thanked 1,797 Times in 937 Posts
Quote:
Originally Posted by ksa8907 View Post
Negligible difference at best. Much like when people say their car is special and gets it's best mileage at 9 million mph.
My favorite is the idiots who claim their car "gets xx mpg no matter how I drive it, all day long." Like, yes--your car, unlike every other car in the world, is not subject to the laws of physics or thermodynamics, and your "results" aren't simply an indicator of your poor record-keeping and observational skills.
__________________
UIUC Aerospace Engineering
www.amateuraerodynamics.com
  Reply With Quote
The Following User Says Thank You to Vman455 For This Useful Post:
UltArc (03-06-2018)
Old 03-05-2018, 10:40 AM   #9 (permalink)
Moderator
 
Vman455's Avatar
 
Join Date: Feb 2012
Location: Urbana, IL
Posts: 1,935

Pope Pious the Prius - '13 Toyota Prius Two
Team Toyota
SUV
90 day: 51.62 mpg (US)

Tycho the Truck - '91 Toyota Pickup DLX 4WD
90 day: 22.22 mpg (US)
Thanks: 198
Thanked 1,797 Times in 937 Posts
This article from how Stuff Works claims fuel meters are temperature-corrected by the pump computer, but doesn't say anything else about it. I've found some sources online that say temperature correction is required in the EU and Canada. Edit: In the UK and Canada, Automatic Temperature Correction is required at gas pumps. The Wikipedia article on fuel dispensers says,

"There are far fewer retail outlets for gasoline in the United States today than there were in 1980. Larger outlets sell gasoline rapidly, as much as 30,000 US gal (110,000 L) in a single day, even in remote places. Most finished product gasoline is delivered in 8,000- to 16,000-gallon tank trucks, so two deliveries in a 24-hour period is common. The belief is that the gasoline spends so little time in the retail sales system that its temperature at the point of sale does not vary significantly from winter to summer or by region."

With no citation, of course, so who knows?
__________________
UIUC Aerospace Engineering
www.amateuraerodynamics.com
  Reply With Quote
The Following User Says Thank You to Vman455 For This Useful Post:
redpoint5 (03-05-2018)
Old 03-05-2018, 10:55 AM   #10 (permalink)
UFO
Master EcoModder
 
UFO's Avatar
 
Join Date: Sep 2010
Location: Denver, CO
Posts: 1,300

Colorado - '17 Chevrolet Colorado 4x4 LT
90 day: 23.07 mpg (US)
Thanks: 315
Thanked 179 Times in 138 Posts
Like Charlie mentions, the fuel is stored underground, so it doesn't matter what the outside temperature is, the fuel is dispensed at virtually the same temperature; fuel density vs. temperature is moot.

__________________
I'm not coasting, I'm shifting slowly.
  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com