MPG with rooftop cargo box
1 - 6 of 6 Posts
Joined
·
23,902 Posts
I don't have a box type roofrack but I would expect at least 10% reduction. At least 5% just for support bars.
The increase of drag is the square of the increase in speed so the faster you go, the greater the effect.
The increase of drag is the square of the increase in speed so the faster you go, the greater the effect.
Joined
·
226 Posts
Here's another freebee, remove any extra weight in the car that you don't need and make sure the tires are inflated properly.
I remember the Mythbusters did a test where they compared AC to windows open at 55 mph and they confirmed that yes, using the AC is more fuel efficient even at just 55 mph because the engine drag is less than wind drag.
I remember the Mythbusters did a test where they compared AC to windows open at 55 mph and they confirmed that yes, using the AC is more fuel efficient even at just 55 mph because the engine drag is less than wind drag.
Something on the roof really hurts mileage. Here's our trips to the Outer Banks for vacation:
With my 2003 Audi A4 Avant 3.0q:
2004: 1,572 miles; 25.80 mpg.
2005: 1,576 miles, 26.63 mpg.
2006: 1,408 miles; 23.31 mpg (bike rack and 1 bike on roof).
2007: 1,345 miles; 20.76 mpg (bike rack and 2 bikes on roof).
2008: 1,307 miles; 21.53 mpg (bike rack and 2 bikes on roof).
2009: 1,350 miles: 21.99 mpg (bike rack and 2 bilkes on roof).
With 2011 JSW TDI:
2010: 1,451; 47.76 mpg (both bikes fit in JSW due to significantlly larger interior storage).
With my 2003 Audi A4 Avant 3.0q:
2004: 1,572 miles; 25.80 mpg.
2005: 1,576 miles, 26.63 mpg.
2006: 1,408 miles; 23.31 mpg (bike rack and 1 bike on roof).
2007: 1,345 miles; 20.76 mpg (bike rack and 2 bikes on roof).
2008: 1,307 miles; 21.53 mpg (bike rack and 2 bikes on roof).
2009: 1,350 miles: 21.99 mpg (bike rack and 2 bilkes on roof).
With 2011 JSW TDI:
2010: 1,451; 47.76 mpg (both bikes fit in JSW due to significantlly larger interior storage).
1 - 6 of 6 Posts
Join the discussion
Recommended Reading
-
Condenser
VW Mk6 Golf, Jetta, Beetle, Sportwagen TDI forumHey guys, looking for some info on what all is needed to be removed to get down to the condenser to replace on an mk6 CJAA Sportwagen. Haven’t found enough solid info on it so I figured I’d try here, the only YouTube video I found that was close was a petrol Jetta but it wasn’t the same.- 1
- 70
-
shagginwagen · updated
-
Changing the CJAA Timing Belt Without Removing the Motor Mount
VW Mk6 Golf, Jetta, Beetle, Sportwagen TDI forumI have a 2011 VW Jetta Sportwagen TDI (CJAA). I recently changed the timing belt and found there are two methods. One suggests the removal of the engine mount and the other does not. When changing the timing belt in this car without removing the engine mount there is very limited space to...- 1
- 119
-
Jay Miller · updated
-
Brake Bleeding Procedure for 2013 Jetta
VW Mk6 Golf, Jetta, Beetle, Sportwagen TDI forumI recently installed a brake master cylinder on a 2013 Jetta and ended up getting air into the system. I bled the system the conventional way, but could not get a good pedal---could only get a good pedal after pumping the pedal twice, indicating that there was still air in the system. After...- 1
- 138
-
Codes P0341 and P00C6
VW Mk6 Golf, Jetta, Beetle, Sportwagen TDI forumHi Everyone, I took my cylinder head off to remove a snapped injector clamp bolt. Whilst at it, I changed the fuel filter. I removed vacuum pump and only loosen the cam pulley to help take the cylinder head off. I have used a vacuum extractor to purge air out of the system. Tried starting and...- 1
- 171
-
Willowdiy · updated
-
2012 Jetta tdi stalled now no start?
VW Mk6 Golf, Jetta, Beetle, Sportwagen TDI forumHey everyone I have 2012 tdi 2.0l Auto 260 k everything f was working great the other day went to leave work as I was going from revers to forward the car jumped and stalled? Now when I turned it over there’s no compression sound I’m thinking when it stalled is it possible the timing belt jumped...- 1
- 160
Join now to ask and comment!