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The problem is that the returns aren't that great, even if the costs aren't that bad. Plus, you're up against all the 'chip' manufacturers, who say that you MIGHT get better fuel economy, or better acceleration, etc. But even they won't make any promises
Let's take me as an example. I drive a 2013 BMW 325d estate. I do about 15k a year, at roughly 45 mpg. The same as your example. That currently costs me about £2000 in fuel a year, about 50% of which is company mileage.
The savings by going from 10 mpl to 11 mpl would be about £160 a year. Take out the company paid-for mileage, and it's about £80 a year that I am personally saving. I change my car roughly every 2.5 to 3 years, so if the invention costs more than £200, then it's not going to be worth it - unless it's going to add to the value of the car at the end of it. To do that, it's got to get widespread acceptance (i.e. large numbers of people using it), and widespread independent testing.
In addition, you've got to supply to me that it isn't going to pose any risk to my warranty for me to even consider it. I'm assuming it's notifiable to my insurance company (after all, it is a modification, and they state ALL modifications must be notified), so there may be an additional expense there too.
Finally, it's going to come up to MOT sooner or later. Will the modification make any difference ? Can you guarantee that it won't make a difference ?
Edited by RobJP on 25/09/2014 at 12:56
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