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Old 08-02-2003, 12:06 PM
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Premium Gasoline?

Ok guys, I know this car isn't exactly a hotrod, but I just bought a Lincoln Navigator, and I've looked on some of their forums and those guys have no idea about engines or anything. So I came here figuring you could still help. This is the only question of a non hot rod nature I'll ask, I promise. It has a 5.4 L(330 cubic inches for the metrically challenged) 32 valve DOHC Ford engine with 9.5:1 compression and calls for 91 octane which you can't get because mid is 89 and premium is 93. Now I'm going to be driving this thing for business alot, like 1000 miles a week or more maybe. Is there anything I can do to cheapen my gas expense. Do you think it could possibly take 89 octane? How about octane booster, do those work and would they be cheaper? It gets about 17 mpg on the highway which I thought was pretty good after drving my monte carlo at 12 mpg, but not when I'm doing those numbers and it comes out of my pockets. I filled up yesterday, $47! Any help is appreciated-Thanks

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Old 08-02-2003, 12:34 PM
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Try some 89and listen for detonation.Or depending on how the puter operates(I don't know notta about puterized engines) feel for a loss in performance due to ignition retard from theknock sensors telling the puter to retard the timing.
Also Id recomeend Sunoco's gas they seem to have the best blend.Well for wideopen throttle anyway.I read a thing on that once,I think that means more RON than MON or somethng.I guess and correct me if I'm wrong but more MON helps in part throttle detonation and more RON helps in wide open throttle detonation.
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Old 08-02-2003, 01:04 PM
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9.5 to 1 does sound a little high for 89 octane, but just this last week I was listening to a talk show discussing an article about higher octane fuels. It said using higher octane on cars that did not call for it was a complete waste and that in fact most cars calling for the higher octane would run just fine on the 89 octane.
The 89 octane is worth a try. That car should have a knock sensor and it will back off the timing so the engine should not knock which could cause some damage. Listen for detonation as 78 monte said. Don't fill it all the way up all the way the first time and have a can of octane boost in hand, just in case. The worst that should happen is you will notice a drop off in performance & fuel mileage.
Also how hard you drive it will have a big effect. Let us know how it turns out
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Old 08-02-2003, 04:26 PM
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The computer will take care of the timing and adjust for your low octane fuel, power and mileage may take a small hit. You will have to test it to see if it will matter much and if it is worth it to run the better fuel. I bet it won't matter one bit on the highway, but towing may be a different story.
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Old 08-02-2003, 06:31 PM
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http://hotrodders.com/kb/search.pl?T...atings&match=1
Try this one, you may have to surf from the bottom to get awy from the math behind it. Additional Gasoline and Octane Ratings Reading has all the laymans terms.
http://chemistry.about.com/library/w...=octane+rating
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Last edited by 1BAD80; 08-02-2003 at 11:19 PM.
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