[77newell]

If it were possible to get a 2-3MPG increase from using an additive like this every trucker in the country would be using it and the major trucking companies would mandate its use. None of that is happening. That isn't to say the advantages of using it may not outweigh the cost, but it the proposed mileage increase simply isn't real.

Now, you don't have to take my word for it, it will do no harm to your engine so try it and see what happens. It's a low cost investment and you will find out if there is a big time return or not.