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MPG gain. #4658329
02/06/18 07:41 PM
02/06/18 07:41 PM
Joined: Nov 2014
Posts: 598
Denver
marine65 Offline OP
marine65  Offline OP

Joined: Nov 2014
Posts: 598
Denver
Put a bottle of Techron complete fuel system cleaner into the Sentra that has 186K miles on it.
Before the treatment the info center said I was averaging 35.4 MPG.
After I ran the treated tank out and refilled I reset the info center.
Now after several fill ups and no change in driving habits it says 37.1 MPG.
I'm really surprised by this.


2018 Hyundai Elantra GT
2018 Hyundai Elantra GT
yup got two of them.
Re: MPG gain. [Re: marine65] #4658341
02/06/18 07:51 PM
02/06/18 07:51 PM
Joined: Aug 2002
Posts: 14,874
Silicon Valley
PandaBear Offline
PandaBear  Offline

Joined: Aug 2002
Posts: 14,874
Silicon Valley
Weather getting warmer?


"You keep asking questions PandaBear and you'll end up a vegetarian like my wife" - Camu Mahubah
Re: MPG gain. [Re: marine65] #4658348
02/06/18 07:56 PM
02/06/18 07:56 PM
Joined: Nov 2014
Posts: 598
Denver
marine65 Offline OP
marine65  Offline OP

Joined: Nov 2014
Posts: 598
Denver
Never thought of that.
But this car has never done 37.1 MPG in the 90K miles that I've had it.


2018 Hyundai Elantra GT
2018 Hyundai Elantra GT
yup got two of them.
Re: MPG gain. [Re: marine65] #4658355
02/06/18 08:01 PM
02/06/18 08:01 PM
Joined: Jan 2009
Posts: 6,804
New England
gathermewool Offline
gathermewool  Offline

Joined: Jan 2009
Posts: 6,804
New England
You've averaged this increased MPG over the past few fillups or just this one?


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter (64,774 miles)
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
Edge 0W-20 + FU filter (40,803 miles)
Easy to check [Re: gathermewool] #4658398
02/06/18 08:37 PM
02/06/18 08:37 PM
Joined: Aug 2010
Posts: 6,231
Champlain/Hudson Valley
Kira Offline
Kira  Offline

Joined: Aug 2010
Posts: 6,231
Champlain/Hudson Valley
HARD MILEAGE CALCULATION:
Fill your tank on the first of the month. Note the miles. Note the volume in gallons. I add a column for the price paid too.
Drive and fill as needed through the month recording every fuel purchase.
On the last day of the month fill your tank. Note the details as usual.

Subtract the starting miles from the finishing miles. That's your TOTAL MILES FOR THE MONTH.
Add up the gallons except for the first fill up. That first fill up gets you to a "zero". That's your TOTAL GALLONS FOR THE MONTH.
Divide the TOTAL MILES by the TOTAL GALLONS and you get irrefutable mileage.

The gallons from the last fill up of the month brings you to the next month's zero.

You can do this weekly too, if you want.

It really is the ONLY way to do it. (Flame suit on)

Re: Easy to check [Re: Kira] #4658481
02/06/18 10:12 PM
02/06/18 10:12 PM
Joined: May 2002
Posts: 1,787
St. Charles County, Missouri
csandste Offline
csandste  Offline

Joined: May 2002
Posts: 1,787
St. Charles County, Missouri
Originally Posted By: Kira
HARD MILEAGE CALCULATION:
Fill your tank on the first of the month. Note the miles. Note the volume in gallons. I add a column for the price paid too.
Drive and fill as needed through the month recording every fuel purchase.
On the last day of the month fill your tank. Note the details as usual.

Subtract the starting miles from the finishing miles. That's your TOTAL MILES FOR THE MONTH.
Add up the gallons except for the first fill up. That first fill up gets you to a "zero". That's your TOTAL GALLONS FOR THE MONTH.
Divide the TOTAL MILES by the TOTAL GALLONS and you get irrefutable mileage.

The gallons from the last fill up of the month brings you to the next month's zero.

You can do this weekly too, if you want.

It really is the ONLY way to do it. (Flame suit on)


Or just use an app. Fuelio does that and a whole lot more.


2017 Kia Soul Plus-- Super Tech Synthetic 5w30 59000 miles
Re: MPG gain. [Re: marine65] #4658482
02/06/18 10:13 PM
02/06/18 10:13 PM
Joined: Mar 2016
Posts: 1,260
CA
CharlieBauer Offline
CharlieBauer  Offline

Joined: Mar 2016
Posts: 1,260
CA
I'm not surprised. I've had excellent results on a short tripped non top tier filled vehicle at much lower mileage than your 186k.

In your case, I would put in another bottle. At 186k there is probably more to clean.

In fact, I would suggest using something stronger through the air intake eg the 3M kit or head to Walmart for their $20 fuel injector service (where they meter the cleaning solution through the air to clean the combustion chamber and add a (weaker) fuel injector cleaner to your tank to clean the injectors).


It ain't what you don't know that gets you into trouble. It's what you know for sure that ain't so.

- mistakenly attributed to Mark Twain
Re: MPG gain. [Re: marine65] #4658539
02/06/18 11:24 PM
02/06/18 11:24 PM
Joined: Dec 2016
Posts: 8,017
Waco, TX
Linctex Offline
Linctex  Offline

Joined: Dec 2016
Posts: 8,017
Waco, TX
I had a bottle of Valvoline SynPower fuel injector cleaner make a similar difference about 12-13 years ago.

It's gone, but Techron is supposed to be better anyway.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: MPG gain. [Re: marine65] #4658619
02/07/18 01:32 AM
02/07/18 01:32 AM
Joined: Dec 2017
Posts: 3,931
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline

Joined: Dec 2017
Posts: 3,931
SE British Columbia, Canada
The computer measures mpg by measuring the frequency of the fuel injectors. If one or more injectors was partially plugged, the frequency will increase to compensate and the computer will incorrectly indicate poor gas mileage. Cleaning the injector will help unplug it and the frequency will now be lower, indicating better mileage. Of course you could manually keep records of mileage and fuel used to check your gas mileage. If you did this and confirmed the gas mileage before and after the treatment then I guess you improved the atomization and thatís why youíre getting a better burn, hence better mileage.

Last edited by Snagglefoot; 02/07/18 01:33 AM.

If you want the job done right......do it yourself.
Re: MPG gain. [Re: marine65] #4658626
02/07/18 01:52 AM
02/07/18 01:52 AM
Joined: Dec 2009
Posts: 26,894
Regina, Saskatchewan, Canada
Garak Online content
Garak  Online Content

Joined: Dec 2009
Posts: 26,894
Regina, Saskatchewan, Canada
It's certainly possible, but it's so hard to measure, especially with all the variables. PandaBear mentioned the weather. Our temperatures, and my mileage, went down the toilet recently.


Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, Wix 57356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515
Re: MPG gain. [Re: marine65] #4658662
02/07/18 04:14 AM
02/07/18 04:14 AM
Joined: Sep 2007
Posts: 426
northern NY
Driz Offline
Driz  Offline

Joined: Sep 2007
Posts: 426
northern NY
.l bet warmer weather in Denver is the reason. It pops early and warm there unlike on the Least Coast

Re: MPG gain. [Re: marine65] #4659376
02/07/18 07:32 PM
02/07/18 07:32 PM
Joined: Jan 2009
Posts: 6,804
New England
gathermewool Offline
gathermewool  Offline

Joined: Jan 2009
Posts: 6,804
New England
I just checked my Legacy's average MPG - it's been warmer, but my average is 3 MPG LESS! What gives!?

The answer, in Borat's voice: "My wife". Seriously, my wife is the reason. She's a conservative driver, but she can't coast to save her life. She's been driving my car, because the Legacy gets better gas mileage than the Forester XT, and the mileage has dropped from just over 30 MPG to just over 27 MPG. I drove it to go to the Dr two days ago and I was able to raise it 0.5 MPG in just a short trip!

My point: every day the MPG varies. From cold to warm to slushy to dry.


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter (64,774 miles)
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
Edge 0W-20 + FU filter (40,803 miles)
Re: MPG gain. [Re: gathermewool] #4661252
02/09/18 07:22 PM
02/09/18 07:22 PM
Joined: Nov 2014
Posts: 598
Denver
marine65 Offline OP
marine65  Offline OP

Joined: Nov 2014
Posts: 598
Denver
Originally Posted By: gathermewool
You've averaged this increased MPG over the past few fillups or just this one?

Its been pegged on 37.1 for several weeks after the treatment.
I use a tank a week ,about 10 gallons per fill up.
I never go lower then a 1/4 tank.
I also us Phillips 66 top tier gas all the time from a very high volume station.
Warm weather or cold weather its never done this well in close to 100K I've had the car.
I will try another bottle just to be sure.


2018 Hyundai Elantra GT
2018 Hyundai Elantra GT
yup got two of them.
Re: Easy to check [Re: Kira] #4661255
02/09/18 07:24 PM
02/09/18 07:24 PM
Joined: Nov 2014
Posts: 598
Denver
marine65 Offline OP
marine65  Offline OP

Joined: Nov 2014
Posts: 598
Denver
Originally Posted By: Kira
HARD MILEAGE CALCULATION:
Fill your tank on the first of the month. Note the miles. Note the volume in gallons. I add a column for the price paid too.
Drive and fill as needed through the month recording every fuel purchase.
On the last day of the month fill your tank. Note the details as usual.

Subtract the starting miles from the finishing miles. That's your TOTAL MILES FOR THE MONTH.
Add up the gallons except for the first fill up. That first fill up gets you to a "zero". That's your TOTAL GALLONS FOR THE MONTH.
Divide the TOTAL MILES by the TOTAL GALLONS and you get irrefutable mileage.

The gallons from the last fill up of the month brings you to the next month's zero.



You can do this weekly too, if you want.

It really is the ONLY way to do it. (Flame suit on)


Thanks for the suggestion but thats way more work then i want to do.


2018 Hyundai Elantra GT
2018 Hyundai Elantra GT
yup got two of them.
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