Enviro tabs

[kev1000]

Has anyone heard of them or tried them?
It's a tablet you add to your petrol supposedly for better mpg and lower emissions.
A work colleague gave me one this morning and he says they do work.
Me on the other hand am a bit more skeptical.
Wouldn't mind some more mpg though!

 

[kev1000]

Just an update on this :
I filled the car then I drove 185 miles.
I then filled up again (€39 to fill) and added 1 of these tablets.
I drove a further 185 miles and went back and filled up again.
Not only was there no improvement in mpg but it took €47 to fill.