My brother is "new dawn" 's cousin. He uses a 1 micron paper filter whole house water filter. He puts about 50% ATF in every tank and has done nothing to modify the fuel system on his Dodge 3500 Cummins (Yes, he works on Ford's but drives a Dodge ;-)

He gets only slightly less mpg, but at $2.50 per gallon total fuel cost, he doesn't care. He has used almost 100% ATF, but said the smell was a little too bad coming out the tail, so 50% is all he does. His Cummins is the 24v 3rd gen.

We don't have the inspections like California and we don't have a law out-lawing renewable fuels in your tank like California (no veggie-diesel in California now - they want that tax stream more than a green state)