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I see 15/22 in my 87 535is (o2 sensor unplugged) (archive)
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Posted by Tim in N. FL on October 16, 2000 at 14:37:26:

In Reply to: fyi 15/27mpg in 88 535is with JC chip posted by floyd on October 15, 2000 at 10:04:04:

Thanks for listing these mpg numbers guys. My '87 535is w/149K gets 15mpg in all city driving and 22mpg on highway @70-80mph. Now, I calculated this the "old-fashioned" way. The OBC actually gives me slightly higher mpg #s. Oh, BTW, my o2 sensor is unplugged...still considering whether or not to fix that problem.

Cheers,
Tim

Just for anyone who is curious, here is what mileage I get in my 88 535is with 245k miles.
Pure city 15 mpg. Pure highway at 70mph, 27 mpg.
It has the JC chip and I use premium.

Last night we made a run from Sacramento to Lake Tahoe.
Started out at 300 feet elevation and the summit is over 7300 feet. We went for dinner and ran between 65 and 80 mph. The average for last night was 26.7 mpg.

Cheers




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