Q: I've seen online a so-called EcoChip, which is supposed to reduce fuel consumption by up to 55%. Is this legit? Does it work? It plugs into the car's onboard diagnostic system. Will using it void my OEM or my extended warranty? Thanks, your thoughts would be greatly appreciated!
J.M., Flossmoor, Illinois
A: When fuel prices spike, people go looking for something — anything — to boost their miles per gallon. I am skeptical of miracle devices and have seen a lot of useless stuff over the years. One early contraption was a pair of magnets taped onto the fuel line to "align the ions in the gasoline." Farmers know them as cow magnets. Various devices claimed to swirl the incoming fresh air to improve complete combustion. And so on. ... I am open to independent scientific data to support contraption claims. Until then, I will work on improving my driving habits.
