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06 SLK 55 Firemist
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Discussion Starter #1
This weekend I drove from Atlanta to Savannah (240 miles) and back and as was able to do a fair comparison of fuel mileage top up and top down.

Top up average speed 75 MPH mileage 27.1
Top down average speed 71 MPH mileage 24.4

The trip back (with top down) was slightly slower average of 4 MPH. If the speeds had been identical the fuel mileage would have most likely been farther apart.
 

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2005 SLK350 2011 GLK3504X 2006 ML350(selling when GLK arrives)
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Small price to pay for open roadster motoring...[:p]
 

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2007 GL320 CDI, 2005 SLK350 and 2001 SLK320
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What were the wind conditions each way? This makes a big difference. I once took a round trip on the same day with a headwind going out and a tailwind coming home. I got 30% better gas mileage on the return trip.
 

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SLK 350 due 03/05
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Sailing thread

mbslk350 - 3/5/2005 3:32 AM

What were the wind conditions each way? This makes a big difference. I once took a round trip on the same day with a headwind going out and a tailwind coming home. I got 30% better gas mileage on the return trip.
How many knots were you doing?[:D]
 

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Discussion Starter #5
mbslk350 - 3/6/2005 10:32 PM

What were the wind conditions each way? This makes a big difference. I once took a round trip on the same day with a headwind going out and a tailwind coming home. I got 30% better gas mileage on the return trip.
Wind was calm and variable on both trips so I don't believe it was a factor in the results.
 

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SLK 350 Caspian Blue
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it also depends on the terrain, whether you had to climb slopes one way, and going down slopes the other way. once i covered a 350mile drive with one full tank one way, but couldn't quite do that the return trip because i was climbing mountains! i would expect a little more resistance with the top down, but hey julien, the ride is definitely more fun!!! i love it!!![:)]
 
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