So 16 oz per tank with my dual tanks on my Ford should it. Will start this on the next fill up. I am sure I could use some injectors but I do run that good diesel additive once a month and it helps. Getting 14 or 15 now and am curious to see how much difference it makes. 14 is on these hot days when I have alot of running around to do in and out of the truck, motor dont shut off and the AC keeps on blowing until it gets back in the driveway.