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Royal Purple treatment with inconsistent results #4690435
03/10/18 12:04 PM
03/10/18 12:04 PM
Joined: Nov 2005
Posts: 607
Charlotte, NC
gr8gatzby Offline OP
gr8gatzby  Offline OP
Joined: Nov 2005
Posts: 607
Charlotte, NC
My 95 F150 5.8L has always netted me about 9mpg in the 5 years I've owned her. Threw in a can of RP fuel treatment last week and that jumped to 11mpg for that tank of gas that lasted 200mi instead of 170ish. So impressed was I that I treated the next tank of gas with another can of RP, but strangely, I am back to my 9mpg/170 range for that tank every subsequent tank since. Driving patterns and weather conditions were no different on the initial treatment.


'95 Ford F150 | 4x4 | 5.8 | 9MPG
'11 Honda Crosstour | AWD | 3.5 | 21MPG
Re: Royal Purple treatment with inconsistent results [Re: gr8gatzby] #4690470
03/10/18 12:54 PM
03/10/18 12:54 PM
Joined: May 2012
Posts: 1,366
The land of USA-made Subies!
SubieRubyRoo Online happy
SubieRubyRoo  Online Happy
Joined: May 2012
Posts: 1,366
The land of USA-made Subies!
Save your money. It was something other than the fuel additive. Maybe a fuel pump that got more in the tank before shutting off.

Re: Royal Purple treatment with inconsistent results [Re: gr8gatzby] #4690492
03/10/18 01:24 PM
03/10/18 01:24 PM
Joined: Jul 2009
Posts: 601
texas
danez_yoda Offline
danez_yoda  Offline
Joined: Jul 2009
Posts: 601
texas
A little math.

170 miles at 9mpg is about 18.5 gallons of gas
170 miles ar 11mpg is about 15.5 gallons of gas.

Net saving is 3 gallons. $2.50 / gallon is $7.50 saved.

Royal purple magic mix to get that savings... ~$12....... smirk.

Still lost money even if it did work to gain 2mpg

Re: Royal Purple treatment with inconsistent results [Re: gr8gatzby] #4690595
03/10/18 03:21 PM
03/10/18 03:21 PM
Joined: Dec 2016
Posts: 6,258
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,258
Waco, TX
Check your tires pressures - inflate to max allowable for best mileage.


"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: Royal Purple treatment with inconsistent results [Re: gr8gatzby] #4690686
03/10/18 05:31 PM
03/10/18 05:31 PM
Joined: Jun 2003
Posts: 17,362
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,362
Deplorable in apple valley, ca
That mpg is real bad. Have you replaced 02 sensors and coolant temp sensor?


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40

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