Fuel Economy - Hypermiling Dedicated to discussions on fuel economy improvements and related modifications.

couple questions?????

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Old 05-25-2010, 05:11 PM
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couple questions?????

ok so im goin on vacation n since nowaday we r all tryin to save some money in gas, i was wonderin if it was ok to run 91 in it every couple of fill ups, everytime i fill up in town i put 93 in no questions asked, so would it b ok?? also i heard that bp is ethonal free, is that true?? if its ethonal free,would it b better to run ethonal free or run with ethonal. ne thought please
Old 05-25-2010, 10:06 PM
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your car is tuned specifically for 93 octane. i don't know if there is a huge difference between 91 and 93 octane. so i wouldn't go WOT too much. and BP has up to 10% ethanol. its fine to use
Old 05-25-2010, 10:09 PM
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but like if im on the highway since im goin to ny as long as i dont WOT it 91 will b ok like every couple of fill ups?
Old 05-25-2010, 10:12 PM
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yep no problem
Old 05-25-2010, 10:14 PM
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It's al good because all I use is bp or shell I like that nitrogen **** lol. J/k it's all the same crap. Our cars are tuned for low octane and high meaning if the car see'z kr like alot in a certain amount of time it'll go into low octane. Te high octane I think is tuned for 91 because in the owners manual it says lowest grade u should go to is 91 which means to me it's tuned for 91. Just be careful to only get gas where u know they refill there tanks alot.....
Old 05-25-2010, 10:22 PM
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ya i only fill up at either mobil chevron shell n hess sumtimes but i dont go to the lil ma n pa gas stations. aslong as i can fill up on 91 once in a while on this trip
Old 05-25-2010, 10:27 PM
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I know its nice to save money on gas but, really if the price diffrence is like what 10 cents or 15 cents, thats like maybe a buck or two saved on a tank. but its your call buddy! just my opinon
Old 05-25-2010, 10:30 PM
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you won't save much money
but you'll be alright
Old 05-25-2010, 10:33 PM
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our cars pcm has different fuel tables just for situations like this. It has a high octane fuel table, and a low octane table. I learned this recently when I accidentally put 83 octane in my car. The pcm will recognize that a lower octane fuel is being used and knock back timing so you don't blow **** up. Hence why you will see significant horsepower reduction if you do so.

Would I make a habit of putting a lower octane in my tank? No. But it helps to know that our pcm compensates for stupidity.
Old 05-25-2010, 10:34 PM
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well guys he is going on a road trip from south florida(we have 93 octane) up the east coast to NY. thats the reason for the change in octane
Old 05-25-2010, 10:36 PM
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Originally Posted by BLAZIN07SS
well guys he is going on a road trip from south florida(we have 93 octane) up the east coast to NY. thats the reason for the change in octane
ohh ok gotcha lol
Old 05-26-2010, 05:54 AM
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ya im goin from here to new england, n my parents n gf r comin, i always put 93 it n always will but i no they rather put sumthin a lil cheaper in. but as for goin lower i never do
Old 05-26-2010, 06:30 AM
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Not trying to sound like a ass but before u post read the entire thread....

I said this already lol



Originally Posted by mexi_loco
our cars pcm has different fuel tables just for situations like this. It has a high octane fuel table, and a low octane table. I learned this recently when I accidentally put 83 octane in my car. The pcm will recognize that a lower octane fuel is being used and knock back timing so you don't blow **** up. Hence why you will see significant horsepower reduction if you do so.

Would I make a habit of putting a lower octane in my tank? No. But it helps to know that our pcm compensates for stupidity.
Old 05-26-2010, 08:38 AM
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just backing what u said. and I did read what you posted bro.
Old 05-26-2010, 09:01 AM
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Ok sorry. Wasn't meanin to sound like a ass but thanks.
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Quick Reply: couple questions?????



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