Plug in diesel tuning box
Smartalex
Forum Participant Posts: 11
Has anyone used one of these plug in diesel tuning boxes which is supposed to increase MPG by 15 - 20%.
According to the hype it will also increase power and torque.
Other questions: is it legal, does it increase your insurance?
If anyone has used these and can give any valid answers to the above queries or has any advice I would be very interested to hear.
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