I dont know what the rules are here about posting other websites but I came across this article and thought it was pretty cool

Basically this guy got forum members to donate a ton of money to do scientific tests on a bunch of different fuel additives

Here is the link Lubricity Additive Study Results - Diesel Place : Chevrolet and GMC Diesel Truck Forums

 

Yeah it's been posted a few times already, one more won't hurt. Now you know why I only use Opti-Lube products when I'm running diesel.