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.
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' 88 740GLE auto wagon nearly 195,000 and ' 87 240DL auto sedan nearly 135,000
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