Fuel consumption towing a trailer by PaulT



PaulT
We make regular trips down to SW France. Consumption is always at least 45 mpg.

The trip we have just been on we towed down an 8' x 5' x 6' box trailer with a GVW of 1580kg.

Going down it was full so must have been near its GVW. Coming back it was empty so probably weighed about 600kg

I was surprised at the lack of difference in consumption:

Going down full - 26.61 mpg
Coming back empty - 28.17 mpg

Admittedly, probably towing about 5 mph faster coming back but I expected the difference to be much greater.

The other odd thing is that the car usually shows less mpg on the display when driving without a trailer. However, with the trailer it showed more mpg.

Paul
Paul

That apart Mrs Lincoln, did you enjoy the play

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Posted 09 Dec 2010, 08:21 #1 


Leander
Fascinating results!

Since you were pulling at least another 25%, weight-wise, going to France, you would imagine there would be
a commensurate increase in fuel use.

Maybe it is something to do with momentum, or engine load???

I really don't know... but if anyone can explain this phenomenon I'd love to hear it.

Cheers
Leander

Posted 10 Dec 2010, 01:46 #2 

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Jürgen
The air resistance will be more important than the weight, I think.
Jürgen

75ZT Community & Midlands Nano Meets & 75 & ZT Enthusiasts

Posted 10 Dec 2010, 16:01 #3 


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