BMW M5 Forum and M6 Forums banner

1 - 5 of 5 Posts

·
Registered
Joined
·
396 Posts
Discussion Starter #1
I drove Big Red on her 1st road trip to visit my Mom in NE. - about 900 miles round trip. Man, do I love this car! Effortless and gutsy at a moment's command!

Now for the rain part. I headed out of Denver and my gas mileage had settle in around 24.0 MPG while driving about 82 - 85 MPH - I think - wow, this is pretty darn good, until it started raining (pretty hard). As it rained the gas mileage began dropping until it fell to an avg. of 20.5 after about 3 hours of pouring rain. Then it stopped raining, and my avg. gas mileage managed to climbin for the last 80 miles up to 21.2, for the 450 mile trip. Then, on the way home three days later my gas mileage was averaging 24.5 MPG, again travelling at approx. 83 MPH, then it rained the last 100 miles which brought my gas mileage down to 23.0 MPG for the final 450 mile return trip to Denver.

Any similar experiences? I have never really noticed rain causing a deleterious affect on MPG before with other cars.

BTW, I let my older brother, who only has experience with american vehicles, drive the M5 a bit on a very desolate patch of NE. backroads. He is just tooling along through the countryside when we see a long open stretch so I tell him to "kick her in the pants a little". So he does and we rocket up to 135MPH in no time, that beautiful V8 droning through the gears effortlessly. He says, "Wow, this thing pulls like a corvette but drives like a dream". I say, "Uh Huh, can you see why I like BMW's now?"

He was impressed, and I was proud.
 

·
Registered
Joined
·
626 Posts
sarends

I had a similar experience last weekend. I ran about 400KM (240 miles) in the pouring rain, and my fuel economy was about 20% worse than normal. That said, the car handled fine, even at 130KM/H to 140KM/H.

It takes work to push those wide tires through the soup!

Cheers
JJ
 

·
Registered
Joined
·
396 Posts
Discussion Starter #3
Actually, you are right, I only slowed to about 80MPH when it was pouring down pretty hard, and the car felt very stabile.

jaj said:
sarends

I had a similar experience last weekend. I ran about 400KM (240 miles) in the pouring rain, and my fuel economy was about 20% worse than normal. That said, the car handled fine, even at 130KM/H to 140KM/H.

It takes work to push those wide tires through the soup!

Cheers
JJ
 

·
Registered
Joined
·
2,564 Posts
Glad the first trip treated you well! All the trips I took in my E39 (even though it wasnt an M5) were gread. NVH levels in that car are so low that a 10 hour trip feels like 2.
Even though the coefficient of friction with the road is lower, the resistance due to moving water is higher. I wouldnt expect it to cause such a huge change, but I also havent daily driven a car with rolling gear like that or 400hp.
:cheers:
 
1 - 5 of 5 Posts
Top