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18 MPG With AC On Versus 23 MPG AC Off 700 1988

posted by  Lummer57 on  Wed Aug 19 12:54 CST 2009
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last visit: Thu Oct 28 03:22 CST 2010
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1988 740 wagon auto. With AC off driving stop/start local I get about 23 mpg. However when I use AC my MPG drops down to about 18 MPG. Big difference(over 20%). Is this normal ? What are others here getting with your MPG with AC on ? Or is there something wrong with my AC system I should address ? It is/was professionally retrofitted to 134A in 2000 by the previous owner. I had it serviced last year. Only maybe unusual thing I note is that when AC is on car seems to have less power but think perhaps this is normal.
--
' 88 740GLE auto wagon nearly 195,000 and ' 87 240DL auto sedan nearly 135,000








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18 MPG With AC On Versus 23 MPG AC Off 700 1988

posted by  Harryl on  Thu Aug 20 07:34 CST 2009
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last visit: Tue Feb 28 10:42 CST 2012
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Guess I'll count myself luck...the latest fillup gave me 21.06 mpg, with AC on most of the time. This is a combination of mostly local driving, with a couple of 70-mile Interstate commutes per week.

The power loss IS noticeable, though.

Harry
1989 745GL, 192,000 miles.








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18 MPG With AC On Versus 23 MPG AC Off 700 1988

posted by  Uncle Olaf on  Wed Aug 19 16:41 CST 2009
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last visit: Mon Oct 10 19:04 CST 2011
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Hey Lummer,



Sounds normal to me. As long as its cooling down well inside, I don't think there's a problem with the A/C. Its quite a lot of drag on the engine. Its normal to feel a loss in power with the A/C running.


Cheers, Jon 'Uncle Olaf'








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18 MPG With AC On Versus 23 MPG AC Off 700 1988

posted by  someone claiming to be fixit2002 on  Wed Aug 19 14:45 CST 2009 [RELATED]

Nothing wrong. I suspect you're probably just using more gas peddle to compensate for the compressor drag. Mine drops about 2-3 mpg but I've got a 5 spd.







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