Varience between tanks? - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 02-11-2007, 11:43 AM   #1
Registered Member
 
Join Date: Oct 2006
Posts: 245
Country: United States
Varience between tanks?

Well was finaly time to refuel. i use the low fuel light as a guide to refuel and i had thought i was on a decent tank (35-36mpg) was just over 300 miles and as im pumping i'm figuring maybe 8.5 gallons would be a good point but it hit there and was still moving after 9! finaly stopped at 9.3X and i clicked it once and then shutoff. worked out to 31.9 mpg!

this is my worst tank ever. I had started doing engine off coasting and figured that anything over 300 miles for lil silver would be a good tank but i got proved wrong. SG was showing just over 30 for the tank but i had been thinking it was off cause last tank was over 36 and that quite a drop from one tank to another,


works out to 11% drop. probly the weather and my short trips combined. i have been using a new route to work and it keep my speeds down and a few opportunities to coast but i guess my car like the steady pace better. or maybe pump was off?? oh well now that i have been logging will just hope was a 1 time thing.
__________________

__________________
"Sylvie" 2000 Honda Insight 5 Speed


LxMike is offline   Reply With Quote
Old 02-11-2007, 05:54 PM   #2
Registered Member
 
Join Date: Oct 2006
Posts: 557
Country: United States
Worship at the altar of the god Average. Post faithfully and he will level the mountains and fill the pot-holes, as well as make some sense of the occasional random superlative or abysmal single tank readings.
Check out the tank-by-tank numbers in my garage. Your 32 out of an expected 36 isn't that far out in comparison.
__________________

Lug_Nut is offline   Reply With Quote
Old 02-11-2007, 06:38 PM   #3
|V3|2D
 
thisisntjared's Avatar
 
Join Date: Mar 2006
Posts: 1,186
Country: United States
Send a message via AIM to thisisntjared
if your average fill is 10 gallons and if there can be an error of up to 1.5 gallons thats an error margin of +/-15%
__________________
don't waste your time or time will waste you
thisisntjared is offline   Reply With Quote
Old 02-11-2007, 07:06 PM   #4
Moderator
 
GasSavers_DaX's Avatar
 
Join Date: Oct 2005
Posts: 1,209
Country: United States
Yep, law of averages owns you. Look at my gaslog - very hilly, but I post EVERY tank and it all evens out.
GasSavers_DaX is offline   Reply With Quote
Old 02-12-2007, 09:26 AM   #5
Registered Member
 
Join Date: Mar 2006
Posts: 675
Country: United States
As you can appreciate, other people have the same problem you explained, more or less. I get bamboozeled by this more regularly than not. I think it might be more noticable because your mileage is higher, so that any variation shows up more. Also, I think this stuff is a lot like trying to watch a pot boil water, it just won't boil while you watch.

Post all of your tanks to the gaslog and keep working on it. The gas log has been a great source of insight for the very reasons you have just experienced. You are not alone!
Gary Palmer is offline   Reply With Quote
Old 02-12-2007, 01:05 PM   #6
Registered Member
 
Join Date: Oct 2006
Posts: 245
Country: United States
I think the 36 might have been a fluke tank. the refill before the pump had stopped and i probly click 2-3 time to get to the next dollar ammount then the next fill i click once and that probly made it look like i used less. i'm gonna have to use same refill procedure now to keep that variable somewhat level. warmer weather is coming and i know i will be able to hit tanks of 35+ and hopefully pull a 40.
__________________
"Sylvie" 2000 Honda Insight 5 Speed


LxMike is offline   Reply With Quote
Old 02-12-2007, 01:22 PM   #7
Registered Member
 
JanGeo's Avatar
 
Join Date: Jan 2006
Posts: 2,442
Country: United States
Send a message via Yahoo to JanGeo
You should figure out the gas tank capacity since a low fuel light indicates about 2 gallons remaining you mayhave been short pumped or temperature corrected for colder gas (yeah right). My SG has been within about .1 gallons every time but I keep clicking until it spills on the ground or darn close to it - I usually just pump for a couple of seconds and let go and wait a few and then repeat about 5 or 6 times so that it never reaches the vacuum holes on the filler nozzle. It seems to work out pretty good that way - still think a clear sight hose with an over flow tank would be ideal.
JanGeo is offline   Reply With Quote
Old 02-12-2007, 06:22 PM   #8
|V3|2D
 
thisisntjared's Avatar
 
Join Date: Mar 2006
Posts: 1,186
Country: United States
Send a message via AIM to thisisntjared
i found the biggest variance between tanks has to do with the angle of the ground. if the driver's side rear is up it fills more than if the driver's side rear is lowest. the difference is rediculous.
__________________
don't waste your time or time will waste you
thisisntjared is offline   Reply With Quote
Old 02-13-2007, 06:57 PM   #9
Registered Member
 
GasSavers_brick's Avatar
 
Join Date: Mar 2006
Posts: 162
Country: United States
If anybody ever feels bad about the variance between tanks, just have a look at the Warp Wagon's gaslog and feel bad no more. Today was the first time in two months (on the nose, actually) that I've been able to get a calculated average to come reasonably close to the MFD's estimate. Before now they have been flopping back and for between high 30s/low 40s and mid 50s while the MFD tells me something in the range of 47-48mpg.

The Prius is a strange beast, indeed. Strange but good.
__________________

__________________
'07 Toyota Prius
GasSavers_brick is offline   Reply With Quote
Reply

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Rolling Averages? dunderhi Fuelly Web Support and Community News 7 08-17-2015 11:42 AM
Location awareness threar Fuelly Web Support and Community News 1 06-24-2010 09:09 AM
Gallons (US Liquid/Imperial) MorpheusUK Fuelly Web Support and Community News 2 05-01-2010 07:02 AM
Reasonability checks on input Cookie Fuelly Web Support and Community News 11 07-07-2009 09:38 AM
fuel economy experiment link kickflipjr General Fuel Topics 3 12-07-2005 07:53 AM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 03:45 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.