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#4758181 - 05/15/18 07:27 PM STP Fuel Cleaner & Better MPG?
Greg L Offline


Registered: 05/22/06
Posts: 648
Loc: 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


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#4758187 - 05/15/18 07:34 PM Re: STP Fuel Cleaner & Better MPG? [Re: Greg L]
JustN89 Online   content


Registered: 06/27/17
Posts: 399
Loc: 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.

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#4758193 - 05/15/18 07:38 PM Re: STP Fuel Cleaner & Better MPG? [Re: Greg L]
fdcg27 Offline


Registered: 09/25/09
Posts: 15556
Loc: OH
I typically see unusually high fuel economy when running any fuel system cleaner.
Don't know why, but it does happen.
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17 Forester 12K MSS 0W-20
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01 Focus ZX3 118K PP 5W-20
96 Accord LX 104K T5 10W-30
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#4758207 - 05/15/18 08:07 PM Re: STP Fuel Cleaner & Better MPG? [Re: fdcg27]
Zee09 Offline


Registered: 05/05/18
Posts: 142
Loc: W. Palm
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.

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#4758219 - 05/15/18 08:25 PM Re: STP Fuel Cleaner & Better MPG? [Re: fdcg27]
boom10ful Offline


Registered: 01/17/17
Posts: 124
Loc: 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.

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#4758236 - 05/15/18 08:43 PM Re: STP Fuel Cleaner & Better MPG? [Re: Greg L]
HondaBroMike Offline


Registered: 11/02/17
Posts: 307
Loc: sev srv TX, 0w-20 convert!
But top tier gas and use the highest octane if you are battling FD issues.
_________________________
Got Idemitsu lightweight low viscosity 0w-20 oil with density higher only by the mighty Redline 10w-40. It's hard to imagine a thin 0w20 oil being denser than even a heavy 10w40 but this is the case.

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#4758344 - 05/15/18 11:48 PM Re: STP Fuel Cleaner & Better MPG? [Re: Greg L]
raytseng Offline


Registered: 12/11/08
Posts: 2309
Loc: 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.



Edited by raytseng (05/15/18 11:51 PM)

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#4758905 - 05/16/18 03:18 PM Re: STP Fuel Cleaner & Better MPG? [Re: Greg L]
Nick1994 Online   content


Registered: 02/19/13
Posts: 9991
Loc: 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 77k PU 5w30 & OEM
2000 Toyota Camry 2.2L 228k M1 AFE 0w30 & Wix
1996 Jeep Cherokee 4.0L 145k M1 HM 10w40 & Fram Ultra

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