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#4690435 - 03/10/18 11:04 AM Royal Purple treatment with inconsistent results
gr8gatzby Offline

Registered: 11/22/05
Posts: 604
Loc: 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

#4690470 - 03/10/18 11:54 AM Re: Royal Purple treatment with inconsistent results [Re: gr8gatzby]
SubieRubyRoo Online   content

Registered: 05/14/12
Posts: 885
Loc: Winchester, Indiana
Save your money. It was something other than the fuel additive. Maybe a fuel pump that got more in the tank before shutting off.

#4690492 - 03/10/18 12:24 PM Re: Royal Purple treatment with inconsistent results [Re: gr8gatzby]
danez_yoda Online   content

Registered: 07/18/09
Posts: 408
Loc: 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

#4690595 - 03/10/18 02:21 PM Re: Royal Purple treatment with inconsistent results [Re: gr8gatzby]
Linctex Online   content

Registered: 12/31/16
Posts: 5718
Loc: 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."

#4690686 - 03/10/18 04:31 PM Re: Royal Purple treatment with inconsistent results [Re: gr8gatzby]
Chris142 Online   content

Registered: 06/05/03
Posts: 16533
Loc: Deplorable in apple valley, ca
That mpg is real bad. Have you replaced 02 sensors and coolant temp sensor?
02 Wrangler super-s 10w30
87 F250 proline 15w40
04 Tahoe super-s 10w30
Z400 Lucas 10w30
KLR250 Maxima 10w40
Can am maveric edge 5w40
57 case tractor 15w40