before i get a tune i would like to know how i can test the gas from a couple of stations. i usally get shell and i know all gases are not created equal so..... shell only provides 91 octane and one gas station in my town offers 93 octane and its called plaza gas its a small convience store i think owned by the murfins store. any way i want to figure out if the 93 octane gas is quality or crap so when i order my tune i can figure out wich octane ratting is right for me
.....ps does anyone know how to gap my spark plugs ??
before i get a tune i would like to know how i can test the gas from a couple of stations. i usally get shell and i know all gases are not created equal so..... shell only provides 91 octane and one gas station in my town offers 93 octane and its called plaza gas its a small convience store i think owned by the murfins store. any way i want to figure out if the 93 octane gas is quality or crap so when i order my tune i can figure out wich octane ratting is right for me
.....ps does anyone know how to gap my spark plugs ??
If you use Motorcraft plugs they are pre gapped, won't hurt to double check.... gasoline is not created equal, I would run the shell long before I would run the "mom and pops" fuel Some of the no name brands are surplus fuel that can be bought at cheap prices by the owner, some of that fuel can be a year old Stick with name brands
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Retired Ford Engineer
2005 Gt Mustang 1993 twin turbo 347 Digital Fuel Injected 1979 Digital Injected 347 Five speed 2008 Ranger FX4 extended cab 4.0L auto tran
I stopped at some (Out in the woods) mom and pop store once when i had my cougar, and they had blue gas there, aint that something?
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1999 Ford Mustang Cobra Vert, Black with Tan top, mods: H&R sport springs, built '03 irs, bf brace, 4.56 gears, bushings, polished bassani catback with mac longtubes and O/R-H pipe, strange struts, bilstien shocks, centerforce dfx clutch, aluminum quadrant and firewall adjuster, caster/camber plates, polished and repainted bbk intake, ported lower by NAZ, mgw blue shifter, full length subframe connectors, arp extended wheel studs. More to come!!!
for gaping buy one of those calibators... i dont know how to spell it bc i dont even know if thats the right name for it lol BUT what i do know is u can pick it up at any auto shop. its a silver looking coin with numbers on them. just ask the auto shop guy n he'll get it for u. its only like 3 bucks
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"Show me a good and gracious loser and I'll show you a failure."
Mod list- Cai,TB 65mm, UDP 25 percent and Dual Flowmasters 44s w/ X pipe No Cats 3.5in' tips.
June 5, 2009 - 8.8 rearend
July 7, 2009 - 4.10 gears w/ tuner
soon to come long tube headers...
91octane vs. 93 octane 
Some of the no name brands are surplus fuel that can be bought at cheap prices by the owner, some of that fuel can be a year old 
Stick with name brands
