Good bye Good Mileage?? - Page 5 - Fuelly Forums

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

Reply
 
Thread Tools Display Modes
 
Old 10-14-2008, 08:44 AM   #41
Registered Member
 
Join Date: Feb 2008
Posts: 7
Country: United States
while we are on the topic of lower friction, is it feasible to think that some percentage of mpg is lost as you near a car's need for an oil change? I run full synthetic and change it every 5,000 miles, and I always think I am getting slightly better numbers with nice fresh oil running through it. If it is possible, and not just a million other things that could be effecting mpg at that point in time, it kind of makes me wonder how much the oil is breaking down after 5000 miles. Just a thought...
__________________

bsams is offline   Reply With Quote
Old 10-14-2008, 09:07 AM   #42
Registered Member
 
Join Date: Jul 2007
Posts: 280
Country: United States
You can test it and see exactly how much it's braking down. I always notice a 1-2MPG difference after a change. Also the engine seems to idle smoother. I can actually tell when it's really in need of a change by a slight increased rumbling or vibration at idle, it's very slight but you can tell it's lugging a bit more.
__________________

itjstagame is offline   Reply With Quote
Old 10-14-2008, 10:58 AM   #43
Registered Member
 
Join Date: Mar 2007
Posts: 125
Country: United States
Quote:
Originally Posted by bsams View Post
while we are on the topic of lower friction, is it feasible to think that some percentage of mpg is lost as you near a car's need for an oil change? I run full synthetic and change it every 5,000 miles, and I always think I am getting slightly better numbers with nice fresh oil running through it. If it is possible, and not just a million other things that could be effecting mpg at that point in time, it kind of makes me wonder how much the oil is breaking down after 5000 miles. Just a thought...
I would say the opposite is true. The longer your oil is used, the better MPG you'll get because oil shears to a lower viscosity. I've noticed this because the milage I get from my Yaris is worse at the start of new oil usage, and improves as the oil is "aged". I realize oil can thicken up too, with age, because of oxidation, but on balance, it often shears to a lowe viscosity, and thinner means less resistence for the crank to turn.
MorningGaser is offline   Reply With Quote
Old 10-14-2008, 11:19 AM   #44
Registered Member
 
Join Date: Sep 2008
Posts: 170
Country: United States
A quicker warm up will save fuel, so I agree on the grill block, tires aired up is a no-brainer, but octane is a bit trickier. Modern cars with knock sensors will adjust the max advance during cruise which highly affects mpg. I tend to run mid-grade 89-90 just to make sure my car is always at max timing. I find my mileage to be 7-10% better running the better gas.
__________________
I exit lean burn when my life is at risk.
1998 Odyssey 24.1 mpg average
1984 crx project now on the road
hondaguy72 is offline   Reply With Quote
Old 10-14-2008, 11:09 PM   #45
Registered Member
 
shatto's Avatar
 
Join Date: Sep 2008
Posts: 345
Country: United States
Quote:
Originally Posted by bsams View Post
while we are on the topic of lower friction, is it feasible to think that some percentage of mpg is lost as you near a car's need for an oil change? I run full synthetic and change it every 5,000 miles, and I always think I am getting slightly better numbers with nice fresh oil running through it. If it is possible, and not just a million other things that could be effecting mpg at that point in time, it kind of makes me wonder how much the oil is breaking down after 5000 miles. Just a thought...
If changing the oil at 5,000 miles is good.....
wouldn't it be better to change it every thousand miles?
__________________
I use and talk about, but don't sell Amsoil.
Who is shatto?
06 4.7 Tundra replaced a 98 Dakota 3.9.
623,000 miles on original engine and transmission, using Amsoil by-pass filters and lubrication.
+Everybody knows something you don't know.
+Artists prove truth can be in forms you don't understand.

Low-Risk Option Trader
Retired Pro-Hunter featured in; 'African Hunter', by James R. Mellon III. and listed in; Rowland Ward's Records of Big Game.
shatto is offline   Reply With Quote
Old 10-15-2008, 05:21 AM   #46
Registered Member
 
GasSavers_BEEF's Avatar
 
Join Date: Apr 2008
Posts: 1,831
I would think that the cost of the more frequent oil changes would out weigh the gains that you would get from it.

5x the oil changes gets expensive especially when you are talking about synthetic.

that is an oil change every month (or for some of us every 2 weeks)
__________________
Be the change you wish to see in the world
--Mahatma Gandhi



GasSavers_BEEF is offline   Reply With Quote
Old 10-15-2008, 05:22 AM   #47
Registered Member
 
Join Date: Oct 2008
Posts: 22
Country: United States
colder weather reduces FE because it slows the atomization of fuel. egr valves recirculates part of the exhaust gas into the intake thus reducing emission(unburnt gas) and increasing FE..

it takes more time for water to evaporate during winter than it is during summer, same applies to gasoline

blocking the grills prevents the ram air from cooling the engine bay, creating hot environment for the engine and the air cleaner.. by then, the engine is sucking hot air.

i have my intake located right after the radiator. i use 93mon octane(lowest from where i am) its turbocharged and no ping even at full boost.

octane is over rated i think, most of the cars nowadays have better combustion design(except maybe overhead valves) withstanding compression ratios that were over the limits in the old days

i think you all get 89mon + 85ron /2 = 87
koji_kabuto is offline   Reply With Quote
Old 10-15-2008, 03:46 PM   #48
Registered Member
 
bowtieguy's Avatar
 
Join Date: Oct 2008
Posts: 1,873
Country: United States
Location: orlando, florida
Quote:
Originally Posted by BEEF View Post
I would think that the cost of the more frequent oil changes would out weigh the gains that you would get from it.

5x the oil changes gets expensive especially when you are talking about synthetic.

that is an oil change every month (or for some of us every 2 weeks)
all else being equal(filter, your time, paying labor, etc), you WOULD save with synthetic. the $10 amsoil series 2000 is guaranteed for 35k miles or 1 year, so MUCH time and/or labor would be saved.

about cold temps...

amsoil has not only the highest flash point, it also has the lowest pour point IN EVERY GRADE. so you're covered hot or cold assuming severe enough cold would slow the flow of dino oil.
bowtieguy is offline   Reply With Quote
Old 10-16-2008, 07:38 AM   #49
Registered Member
 
GasSavers_BEEF's Avatar
 
Join Date: Apr 2008
Posts: 1,831
bowtie,

my response was for shatto that said why not change the oil every 1,000 miles vs every 5,000. which would mean you were changing your 5 times as much.

I was stating that the cost of the oil and filters (plus labor) would out weigh the gas mileage of the more frequent changes.

the big selling point in synthetic oils right now is the extended oil change intervals.

my response was intended for shatto and not really at the subject matter at hand.
__________________
Be the change you wish to see in the world
--Mahatma Gandhi



GasSavers_BEEF is offline   Reply With Quote
Old 10-16-2008, 04:33 PM   #50
Registered Member
 
bowtieguy's Avatar
 
Join Date: Oct 2008
Posts: 1,873
Country: United States
Location: orlando, florida
Beef,

i understand. my thought was in regard to those that reach 3k miles rather quickly and use dino oil. and it just so happens that amsoil can be ~5 times the price of conventional oil.

i drive less than the average driver and still do not look forward to getting under my car twice per year(once for full change, once for filter only).
__________________

bowtieguy 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
Unrealistic Fuel price PaulRosel Fuelly Web Support and Community News 4 01-25-2009 11:42 AM
Recent Fuel-ups Graph Scale rcsheets Fuelly Web Support and Community News 5 09-08-2008 04:11 AM
suggestion for stat comparison zahampton Fuelly Web Support and Community News 1 09-04-2008 08:29 AM
Current TV spot merckrx General Fuel Topics 1 08-14-2008 07:36 AM
P&G Questions dosco General Fuel Topics 25 05-02-2008 01:46 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 10:37 AM.


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