hi flow cat + gasoline - Honda Civic Forum



Fuel, Oil, Cleaners & Other Maintenance Extending the life of your Civic requires the proper fuel, oil, and cleaners, along with other regularly scheduled maintenance.

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Old 04-11-2005   #1
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hi flow cat + gasoline

ive read the manual stating something like using leaded gasoline can cause fires or damage the cat converter/car? but im catless and wanted to know does it make difference on which type gasoline (87/89/91) i use for my vehicle if i have no cat? i have the megan racing downpipe/test pipe.


also, i filled up 91 the other day (dont ask why, it was free gasoline) and i must admit that my car ate it so quick compared to 87/89. any idea why? i thought higher grade fuel was suppose to last longer but i guess not eh?
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Old 04-11-2005   #2
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its probably the cat thats giving you shtty gas mileage. I have that cat too and just recently after I put it on that thing made my car waste more gas.
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Old 04-11-2005   #3
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91 is harder to burn than 87. Resulting in giving you worse gas mileage, its been covered so much on here. 87 is recommended, anything else can hurt power. I use 91 cuz Im boosted, which causes a higher compression. I get about 31mpg turbo'd w/a high flow cat. You shouldnt get any worse gas mileage.

Do the idle learn procedure. If you dont know it, send me a PM, and Ill tell ya how. And only use 87 or 88, whatever you have for regular. Anything else is a waste of money and gas (except that it was free for ya). Good luck.

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