I was about to make a trip to Carlsbad Caverns and have returned from there now. Along the way in West Texas and New Mexico I stopped at several AutoZone stores and none were carrying the “Total” product. I did use 3 bottles of the B-12 in the tank and by the second tank my mileage had came from 8.16 up to 8.88 mpg which I consider a lot since it included climbing through the mountains up to 7000 feet in New Mexico. I believe I told you that I am testing this on a ’92 model 30 foot motor home, with 454 Chevy power train. I am about to make another trip on different roads into Louisiana and I will try the Total. I am looking forward to hitting the 9 mpg mark.