28 Jul '14, 11pm

Which is better for fuel economy, windows open or AC on?

Which is better for fuel economy, windows open or AC on?

Tuesday 29 July, 2014. The Green Piece Column. It’s hot, it’s sticky as you head home from work in your trusty car, so what do you do? Open the windows or turn on the air con? It’s a question that many drivers have pondered over the years and as many of you may already be aware there is a magic number to take into account when it comes to deciding which is a more efficient way to keep cool; 45mph. Below this speed it makes sense to open your windows to let a breeze. Above this speed, the drag effect of the windows being open, begins to make it more fuel efficient to shut them in favour of switching on the air con. This advice is based on the results of a 2004 study by the Society of Automotive Engineers (SAE), which studied the impact of windows open vs. A/C in large saloons and sports utility vehicles. Guideline advice There are plenty of variables that this study couldn’...

Full article: http://www.thegreencarwebsite.co.uk/blog/index.php/2014/0...

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