Not Logged In Log In   Sign Up   Points Leaders
Follow Us    5:16 PM

Message Forum - Read Message

Category: Fuel Economy > Topics Add to favorite topics   Post new topicPost New Topic
Author Topic: Do you keep your tank full? Back to Topics
JunGleJimBo

All-Star Author
Orange County

Posts:738
Points:398,890
Joined:Jun 2009
Message Posted: Sep 25, 2009 2:20:45 PM

After reading several replies on "what time of day do you fill up", it got me to thinking, ...

Should you fill up the tank if you only drive in the city? It seems that if you are only driving a short distance anyway, you can save 50 or more pounds ov extra weight. (Fuel weighs app. 6.25 lbs per gallon. Don't put in 8 gallons, you save 50 lbs.) The problem I see is possibly water getting in the fuel through condensation, or extra dirt or other solids blocking the filter. Any thoughts?

I remember back in high school, a friend had a suoped up American Rambler. All us kids would pitch in our lunch money to put in enough gas to get to and from school. It was a blast to ride around in, but we never had enough money to put in more than 1/4 tank or so. Then in 1-2 days, another trip down to the cheapest station in town! Those were fun times!

JimBo
REPLIES (newest first) Post a Reply
Profile Pic
dontuknowOH
Champion Author Ohio

Posts:3,712
Points:64,065
Joined:Aug 2009
Message Posted: Dec 13, 2014 11:16:04 AM

Normally no, it may get topped when the price is more promising and I plan to drive a hundred highway miles........only then!
Profile Pic
carinthuist
Champion Author San Francisco

Posts:5,532
Points:946,050
Joined:Mar 2012
Message Posted: Dec 12, 2014 11:24:20 AM

yes
Profile Pic
Sugarshaneo7
Veteran Author Michigan

Posts:400
Points:86,465
Joined:Nov 2011
Message Posted: Dec 11, 2014 2:52:39 PM

No
Profile Pic
wayne_m
Rookie Author Savannah

Posts:4
Points:3,605
Joined:Dec 2014
Message Posted: Dec 6, 2014 12:51:29 PM

I've always heard that it is cheaper to keep the top half of the tank full than the bottom half.

Part of it is that if you do this, you will never run out and incur the expense of roadside assistance, and if you're never low, you won't have to worry about running out when you need to go somewhere unexpectedly.

Another thing to consider: The reason aircraft are parked with full tanks is because the air in the tank expands when warm, and contracts when cool. This causes the tank to "breathe," which draws in moisture, which condenses on the top surface and then falls to the bottom. When it's there, it can't evaporate. An airplane that gets water in the fuel line while it's flying is not a good thing! It's less critical with cars, but certainly annoying. In cars, it's less of an issue; I haven't seen an epidemic of cars stalled because of water in the lines, but I have had to replace a couple of rusted-out fuel tanks.
(At work, recently, I did deal with the issue of a vehicle with water in the fuel, probably caused by this very issue. It's very humid here, and we have had a number of days where everything was wet with condensation.)
Profile Pic
PaylessKY
Champion Author Kentucky

Posts:11,635
Points:2,270,320
Joined:Oct 2008
Message Posted: Dec 6, 2014 8:47:49 AM

When I put gas in the tank I fill up.
Profile Pic
GasMiser718
Champion Author Detroit

Posts:2,525
Points:211,805
Joined:Apr 2006
Message Posted: Dec 6, 2014 12:53:54 AM

I fill up in the winter no lower then 1/2 tank....
Profile Pic
Madridjoe
Veteran Author Lancaster

Posts:458
Points:244,860
Joined:Jun 2007
Message Posted: Dec 1, 2014 9:01:42 AM

I fill it when it gets to 1/2
Profile Pic
twt
Champion Author Virginia Beach

Posts:13,314
Points:1,670,310
Joined:Mar 2005
Message Posted: Dec 1, 2014 3:15:36 AM

I fill, when it reaches 1/4 tank.
Profile Pic
JohnCur
Veteran Author New Jersey

Posts:262
Points:488,700
Joined:Feb 2013
Message Posted: Dec 1, 2014 12:04:26 AM

i try
Profile Pic
greydog13
All-Star Author Iowa

Posts:740
Points:953,595
Joined:Feb 2011
Message Posted: Nov 30, 2014 11:42:51 PM

yes
Profile Pic
carinthuist
Champion Author San Francisco

Posts:5,532
Points:946,050
Joined:Mar 2012
Message Posted: Nov 28, 2014 11:41:39 PM

yeah
Profile Pic
GLM4205
Champion Author Toledo

Posts:6,613
Points:1,408,685
Joined:Dec 2010
Message Posted: Nov 28, 2014 7:57:30 PM

Mostly
Profile Pic
krazkar
Champion Author Calgary

Posts:3,157
Points:963,410
Joined:May 2012
Message Posted: Nov 27, 2014 11:27:06 PM

It is always good to keep the tank above half in my mind. Not just in winter, but at all times. If there ever is an emergency, you won't need to think about fuel.
I see on the news when all the big storms were happening. You see how the fuel stations are packed with people trying to get gas. If you always have a fuel tank over half, you can just hop in and go.
Profile Pic
RealtorJeff
All-Star Author San Diego

Posts:628
Points:602,275
Joined:Apr 2005
Message Posted: Nov 27, 2014 5:39:27 PM

run to about half a tank
Profile Pic
JohnCur
Veteran Author New Jersey

Posts:262
Points:488,700
Joined:Feb 2013
Message Posted: Nov 27, 2014 2:37:01 PM

a must in winter....never below 3/8
Profile Pic
aaamanMI
Champion Author Ann Arbor

Posts:5,446
Points:1,063,990
Joined:May 2009
Message Posted: Nov 27, 2014 2:35:16 PM

no
Profile Pic
Boyrr
Champion Author Allentown

Posts:17,637
Points:3,837,475
Joined:May 2004
Message Posted: Nov 27, 2014 2:04:03 PM

yes, every time I fill it
Profile Pic
carinthuist
Champion Author San Francisco

Posts:5,532
Points:946,050
Joined:Mar 2012
Message Posted: Nov 27, 2014 11:44:39 AM

yes
Profile Pic
hoopitup2000
Champion Author Virginia

Posts:1,688
Points:535,620
Joined:Jul 2013
Message Posted: Nov 27, 2014 7:27:58 AM

No. . . .
Profile Pic
Mikeyy1960
Veteran Author Cape Coral

Posts:434
Points:178,110
Joined:Aug 2014
Message Posted: Nov 27, 2014 6:58:36 AM

no
Profile Pic
kferd89
Rookie Author Orlando

Posts:1
Points:5,270
Joined:Sep 2012
Message Posted: Nov 27, 2014 12:38:16 AM

I always keep it filled and refill a line or two before E
Profile Pic
Jay4Runner
Champion Author Oakland

Posts:10,944
Points:2,367,320
Joined:Apr 2004
Message Posted: Nov 18, 2014 10:30:51 PM

Just today I topped off when I was at 1/2 tank.
Profile Pic
calypso93
Champion Author Scranton

Posts:13,954
Points:1,566,475
Joined:Mar 2004
Message Posted: Nov 17, 2014 6:14:04 AM

Fill up at 3/8-1/4.
Profile Pic
twt
Champion Author Virginia Beach

Posts:13,314
Points:1,670,310
Joined:Mar 2005
Message Posted: Nov 17, 2014 2:36:17 AM

No. I fill, when it reaches a quarter tank.
Profile Pic
poetdog73
Champion Author Toledo

Posts:1,983
Points:1,182,790
Joined:Aug 2008
Message Posted: Nov 17, 2014 12:19:00 AM

no
Profile Pic
jl1rp
Champion Author New Hampshire

Posts:4,938
Points:1,041,355
Joined:May 2012
Message Posted: Nov 16, 2014 11:13:59 PM

no
Profile Pic
RealtorJeff
All-Star Author San Diego

Posts:628
Points:602,275
Joined:Apr 2005
Message Posted: Nov 16, 2014 8:31:45 PM

Usually fill up at around a 1/4 tank. Do not think there is any advantage to keeping the tank towards empty.
Profile Pic
zippok
Veteran Author Twin Cities

Posts:373
Points:113,120
Joined:Oct 2010
Message Posted: Nov 16, 2014 7:08:57 PM

never let the refineries store their own gas, if everyone did the same they would run out of storage and have to lower the price more to move it.
Profile Pic
GasMiser718
Champion Author Detroit

Posts:2,525
Points:211,805
Joined:Apr 2006
Message Posted: Nov 16, 2014 8:57:14 AM

I go the the station to fill up, then i'll drive till 1/4 tank then fill again.
Profile Pic
Tucsonhomes
Champion Author Tucson

Posts:5,084
Points:866,940
Joined:Jan 2011
Message Posted: Nov 15, 2014 12:45:48 PM

Full at fill up
Until empty
Profile Pic
GLM4205
Champion Author Toledo

Posts:6,613
Points:1,408,685
Joined:Dec 2010
Message Posted: Nov 15, 2014 10:18:44 AM

Like to
Profile Pic
badbobKY
All-Star Author Lexington

Posts:936
Points:24,645
Joined:Aug 2013
Message Posted: Nov 15, 2014 8:59:04 AM

yes
Profile Pic
dontuknowOH
Champion Author Ohio

Posts:3,712
Points:64,065
Joined:Aug 2009
Message Posted: Nov 15, 2014 8:39:58 AM

Our daily driver is a 2 LTR. powered, so I normally keep only 1/3....1/2 tank of fuel aboard, which is used then for mostly city/suburb/shopping routes type driving.

The smaller weight factor aboard is noticed, during stop/go conditions, much less driving highway. No worries because there are fuel stations everywhere along our travel areas city. I never drop capacity enough for the fuel light to come on, but top the tank when prices are the lowest.

I notice that my Aux...DRL's on for highway do use more fuel when driving highway speeds. This with a 2 LTR. engine is because of the extra alternator energy load pulled by the smaller engine when those extra lights are on. The extra fuel tank weight load isn't noticed driving steady highway, with a fuller tank as a mileage loss.

During cold weather I do keep more fuel in the tank, not because of moisture, but for weight balance and less tank filling due to extra restarts cause colder weather Restart Enrichment Losses for engine run time.

Larger engines show less variation in mileage concerning tank fuel weight/accessary use, the idle torque is greater and low engine rpm at highway zone speeds are not significant for those V/6...V/8 engines which have the extra torque where running the alternator toward higher capacity.

Same for fuel tank capacity weight, simply the larger engines never get strained in any way by the minor load changes that a small engine notices as extra loading. aIsi.......
Profile Pic
EVBuddy
Champion Author Nevada

Posts:19,550
Points:3,706,160
Joined:Sep 2004
Message Posted: Nov 14, 2014 12:21:25 PM

No, never full for long
Profile Pic
carinthuist
Champion Author San Francisco

Posts:5,532
Points:946,050
Joined:Mar 2012
Message Posted: Nov 14, 2014 11:33:29 AM

yes
Profile Pic
Boyrr
Champion Author Allentown

Posts:17,637
Points:3,837,475
Joined:May 2004
Message Posted: Nov 14, 2014 6:20:24 AM

yup, every time I fill it
Profile Pic
SRT8TX
Champion Author Dallas

Posts:20,934
Points:1,541,335
Joined:Nov 2010
Message Posted: Nov 14, 2014 2:23:07 AM

Yes
Profile Pic
southtown43701
Champion Author Ohio

Posts:15,682
Points:3,063,300
Joined:Jul 2005
Message Posted: Nov 14, 2014 1:12:51 AM

no
Profile Pic
GasMiser718
Champion Author Detroit

Posts:2,525
Points:211,805
Joined:Apr 2006
Message Posted: Nov 13, 2014 9:26:41 PM

Now its getting cold I won't let it below 1/2 tank...
Profile Pic
krazkar
Champion Author Calgary

Posts:3,157
Points:963,410
Joined:May 2012
Message Posted: Nov 8, 2014 12:23:57 AM

Try to keep over half
Profile Pic
GasMiser718
Champion Author Detroit

Posts:2,525
Points:211,805
Joined:Apr 2006
Message Posted: Nov 7, 2014 12:51:59 PM

I don't let it get below 1/4 tank. Then I fill it up again
Profile Pic
dontuknowOH
Champion Author Ohio

Posts:3,712
Points:64,065
Joined:Aug 2009
Message Posted: Nov 5, 2014 8:21:08 AM

With our vehicles turned off I can say they all have fuller tanks now since the pump prices have dropped to more reasonable prices locally. That's levels of 3/4+ tank from past 1/3 full capacity average. Even the truck/tractor/misc.
Profile Pic
redfish67
Champion Author Dallas

Posts:1,815
Points:458,575
Joined:Dec 2013
Message Posted: Nov 4, 2014 9:44:17 AM

pretty hard to do if you drive
Profile Pic
MertieMan
Champion Author Lexington

Posts:17,684
Points:3,586,185
Joined:May 2005
Message Posted: Nov 4, 2014 6:59:31 AM

Zackly how can you always keep a tank full when it starts going down the moment you drive away from the pumps. Get real!
Profile Pic
poetdog73
Champion Author Toledo

Posts:1,983
Points:1,182,790
Joined:Aug 2008
Message Posted: Nov 4, 2014 12:12:38 AM

yes when gas hits its low spots
Profile Pic
proudvet1
Sophomore Author Atlanta

Posts:103
Points:626,040
Joined:May 2012
Message Posted: Nov 3, 2014 11:20:44 PM

Yes
Profile Pic
GasMiser718
Champion Author Detroit

Posts:2,525
Points:211,805
Joined:Apr 2006
Message Posted: Nov 2, 2014 10:18:42 AM

In the summer I fill it up then drive till its down to 1/4 then fill it up again. Winter time is different I don't like letting condensation build up in the cold tank so I may fill it up every couple of days. I might even put a little bit higher octane fuel in it....
Profile Pic
badbobKY
All-Star Author Lexington

Posts:936
Points:24,645
Joined:Aug 2013
Message Posted: Oct 29, 2014 7:07:46 AM

yes
Profile Pic
Ratso
Champion Author Ohio

Posts:23,393
Points:3,370,570
Joined:Sep 2003
Message Posted: Oct 29, 2014 6:15:57 AM

Yes every time I stop for fuel, I fill it up ....
Profile Pic
randy3116
Champion Author Tennessee

Posts:1,710
Points:556,450
Joined:Oct 2012
Message Posted: Oct 29, 2014 5:42:07 AM

i fill up at each stop when my fuel level reaches the 1/2 mark
Profile Pic
GLM4205
Champion Author Toledo

Posts:6,613
Points:1,408,685
Joined:Dec 2010
Message Posted: Oct 29, 2014 5:36:03 AM

Mostly
Post a reply Back to Topics