Here’s the latest reader question, along with my reply!
Jeff writes: I came across an ad for a product that claims it can increase a car’s fuel economy by a tremendous amount (see here). What is your opinion of such a device and have you any experience with similar products, or one you might recommend? I have a 2003 BMW 540i M-Sport I thought I might try this product on but don’t want to do anything foolish.
My reply: I think it would be extremely foolish to buy a product that claims it can reduce fuel consumption by “up to” a 25 percent and deliver “up to” 35 percent more power – merely by plugging in a $40 device. If it were that simple – and that cheap – to achieve such spectacular gains or even 5 percent of the claimed “up to” of either, then I assure you the car manufacturers would have programmed their cars accordingly from the factory.
Note the lack of specificity. Just “up to” – whatever that means.
It is also telling that there is no technical info/explanation whatsoever on the web site – which is also peppered with embarrassing spelling errors. I smell bullshit.
I would, accordingly, recommend that you save your money and – even more important – not plug in a device of sketchy provenance that might do god-knows-what to your vehicle’s programming and cost you a great deal more than the money you wasted on the device itself.
. . .
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