Recent Topics
2000 satur n l series ok? 108,000 miles
by ziggy
07/16/18 03:33 AM
Help me pick a oil for equinox
by Dylan1303
07/16/18 01:28 AM
Turbo motor raspy exhaust
by Dylan1303
07/16/18 12:59 AM
1995 Buick Roadmaster. Low speed metallic noise
by 10WSmuckers
07/15/18 11:48 PM
Vornado fan
by Throt
07/15/18 11:19 PM
Wash Pads - Tried Three
by JHZR2
07/15/18 09:24 PM
Which UTF/UTHF for Allis Chalmers D17?
by SOHCman
07/15/18 09:16 PM
98 leaves needs work or 02 taurus,which one?
by ziggy
07/15/18 09:06 PM
equinox 0W40
by mobilaltima
07/15/18 09:00 PM
New/Old F1 guy?
by Camprunner
07/15/18 08:28 PM
Schaeffer's on "Wicked Tuna"
by salesrep
07/15/18 08:14 PM
AMSOIL Euro Classic 5W-40 (EFM)
by The Critic
07/15/18 06:27 PM
Occasional battery dummy light
by dja4260
07/15/18 05:59 PM
Weird experience with old separating brake grease
by d00df00d
07/15/18 05:54 PM
Ceiling Finish Help
by coopns
07/15/18 05:10 PM
Thunderbird to Outlook Converters??
by doitmyself
07/15/18 04:41 PM
Blaines does it again
by Nitronoise
07/15/18 04:40 PM
BMW E34/M60 Water Pump Replacement
by kschachn
07/15/18 03:30 PM
Okra: how do you make it and like it?
by car51
07/15/18 03:28 PM
2005 Sienna trans issue
by i6pwr
07/15/18 01:46 PM
Newest Members
Teggy695, DrDanger, XCIDMigs, DONWATERS, VWhite
65487 Registered Users
Who's Online
34 registered (87sammy, 54steve, Astro_Guy, 2015_PSD, 10ecfarmer, alcyon, 4 invisible), 879 Guests and 40 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
65487 Members
67 Forums
287089 Topics
4790303 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Topic Options
#4690435 - 03/10/18 11:04 AM Royal Purple treatment with inconsistent results
gr8gatzby Offline

Registered: 11/22/05
Posts: 607
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 Offline

Registered: 05/14/12
Posts: 1232
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 Offline

Registered: 07/18/09
Posts: 494
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 Offline

Registered: 12/31/16
Posts: 6186
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 Offline

Registered: 06/05/03
Posts: 16947
Loc: 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