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STP Fuel Cleaner & Better MPG? #4758181
05/15/18 07:27 PM
05/15/18 07:27 PM
Joined: May 2006
Posts: 660
N. Calif - State of Jefferson
Greg L Offline OP
Greg L  Offline OP
Joined: May 2006
Posts: 660
N. Calif - State of Jefferson
Having bought a new (to me) 2010 Prius, I went through 2 tank fulls of gas.

On the second tank, I added some STP Super Concentrated Fuel cleaner, in the black bottle.

I would swear it had more MPG with that second tank. Averaged about 52 mpg, with use of Arco gas. (The first tank with no fuel treatment was also Arco gas)

Now I just did a 3rd fill up (Chevron gas this time) and no STP treatment....and now the MPG is back down to 49 mpg average.


Did STP do more than just clean the injectors, or make a difference at all? Should I add another bottle to get the job done even better?

This is the first time I've used this brand in a Prius.


GL


1951 GMC 1/2 Ton 270ci
1996 GMC Sierra 5.7
2002 Dodge Ram 1500 4.7
2008 Jeep Compass 2.4
2010 Toyota Prius 1.8

Re: STP Fuel Cleaner & Better MPG? [Re: Greg L] #4758187
05/15/18 07:34 PM
05/15/18 07:34 PM
Joined: Jun 2017
Posts: 576
DFW
JustN89 Offline
JustN89  Offline
Joined: Jun 2017
Posts: 576
DFW
In all likelihood, it made no difference. If it cleaned injectors, then there's no reason for there to be an immediate drop in MPG on next fill up as the injectors have already been cleaned and should perform the same. That said, there's just too many variables that affect MPG to point to any one thing when it comes to improved MPG.

Re: STP Fuel Cleaner & Better MPG? [Re: Greg L] #4758193
05/15/18 07:38 PM
05/15/18 07:38 PM
Joined: Sep 2009
Posts: 16,108
OH
fdcg27 Offline
fdcg27  Offline
Joined: Sep 2009
Posts: 16,108
OH
I typically see unusually high fuel economy when running any fuel system cleaner.
Don't know why, but it does happen.


18 Accord Hybrid FF
17 Forester 18K VME 0W-20
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95 318i
Re: STP Fuel Cleaner & Better MPG? [Re: fdcg27] #4758207
05/15/18 08:07 PM
05/15/18 08:07 PM
Joined: May 2018
Posts: 1,099
Tri State Conservative
Zee09 Offline
Zee09  Offline
Joined: May 2018
Posts: 1,099
Tri State Conservative
Originally Posted By: fdcg27
I typically see unusually high fuel economy when running any fuel system cleaner.
Don't know why, but it does happen.


Same here and then it falls back to normal.


"If I walked on water, they'd say I couldn't swim."
Re: STP Fuel Cleaner & Better MPG? [Re: fdcg27] #4758219
05/15/18 08:25 PM
05/15/18 08:25 PM
Joined: Jan 2017
Posts: 138
California
boom10ful Online content
boom10ful  Online Content
Joined: Jan 2017
Posts: 138
California
Originally Posted By: fdcg27
I typically see unusually high fuel economy when running any fuel system cleaner.
Don't know why, but it does happen.


Glad I'm not the only one. I experience this as well.

Re: STP Fuel Cleaner & Better MPG? [Re: Greg L] #4758236
05/15/18 08:43 PM
05/15/18 08:43 PM
Joined: Nov 2017
Posts: 312
HondaBroMike Offline
HondaBroMike  Offline
Joined: Nov 2017
Posts: 312
But top tier gas and use the highest octane if you are battling FD issues.



Re: STP Fuel Cleaner & Better MPG? [Re: Greg L] #4758344
05/15/18 11:48 PM
05/15/18 11:48 PM
Joined: Dec 2008
Posts: 2,407
CA
raytseng Offline
raytseng  Offline
Joined: Dec 2008
Posts: 2,407
CA
I've experienced the difference and chalk it up to UCL which make the engine run smoother, but I don't track the MPG so closely so can't comment on that.
Usually I can get the smooth behavior with just maintenance doses level of redline si-1 (to make things easy, I use 1/4th of a bottle every so often or every other tank).

If you noticed a difference, you could get the same results with other additives products, even those that are not as "super concentrated" or less effective at cleaning; as it's the ucl part you want and not necessarily need the cleaning part.


Last edited by raytseng; 05/15/18 11:51 PM.
Re: STP Fuel Cleaner & Better MPG? [Re: Greg L] #4758905
05/16/18 03:18 PM
05/16/18 03:18 PM
Joined: Feb 2013
Posts: 10,851
Phoenix, AZ
Nick1994 Offline
Nick1994  Offline
Joined: Feb 2013
Posts: 10,851
Phoenix, AZ
3 mpg difference in fuel economy isn't as big when you get high mpg as it is when you get low mpg.

For example, a 10 mpg pickup truck getting a 3 mpg (30%) increase is huge.

A 49 mpg car getting a 3 mpg (6.5%) increase isn't that much. You win some and you lose some on tanks.


2015 Hyundai Sonata 2.4L 85k Mobil 1 AFE 0w30 & OEM
2000 Toyota Camry 2.2L 230k Valvoline 5w30 & Fram Ultra
1996 Jeep Cherokee 4.0L 147k Mobil 1 HM 10w40 & Fram Ultra

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