mileage (MPG) drop

[John in CT]

Last weekend my 1995 525im traveled 200 miles North to NH and returned 28-29 mpg by the trip computer. After being parked for the weekend the retuurn trip involved three hours of steady driving rain. A few hours into the trip I was playing with the MPG function when I noticed it was low, like 22-23 at best highway conditions remained.

The O2 sensor is pretty new, plugs maybe 15K miles. I'm wondering if the air filter element could have gotten soaked in the driving rain, any other thoughts?

Thanks in advance,

John in CT
1995 525im w/ 91K miles

[Torque]

There's too many factors ... Steady driving at 65 will return different gas milage than steady driving at 60 etc ...

Or maybe you were looking at Avg1 instead of Avg2 or vice versa.

[632 Regal]

wind direction, altitude change IE climbing up rather than down, different fuel etc etc.

[John in CT]

Nope, I zero'ed both averages using s/r button, speed has surprising little effect I've noticed in the past, but I have always been able to hit 28-29 mpg at steady 75-80 mph. I'll investigate more fully tommorrow,

Thanks, John

[John in CT]

nope, home is generally downhill from New Hampshire, tank was not filled except at beginning of trip. Temps were a little cooler, plus the driving rain....

[632 Regal]

OK sorry I thought this was actual not OBC. The humidity and temp could have changed the readings it got

idonno trying to guess here.

[John in CT]

You know, the "low coolant" flashed for a few seconds when i moved the car before coming home, it never relit. Maybe there's something there......now i'm nervous....

Thanks,

John

[uscharalph]

You know, the "low coolant" flashed for a few seconds when i moved the car before coming home, it never relit. Maybe there's something there......now i'm nervous....

Thanks,

John

What year / model is your BMW? You should fill out your information.

[John in CT]

1995 525i 5 speed as stated in first post...

[uscharalph]

1995 525i 5 speed as stated in first post...

Sorry, my bad.