Wouldn't be my first choice.

A proper map is the best way to go. Generally plug in boxes just increase the injector pulse. Ie. add more fuel.

They work but they are crude.... In my opinion :)
 
£75 vs £150+ genetic remap - if custom remap then £250+
got 100% with great feedback for the plug n play chips on ebay with buyers saying up to 10mpg improvement

ie add fuel would it not make mpg consumption worse

i remember the resistor trick on petrol fuel injector cars which did make mpg worse so i know where your coming from
 
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