Just got my 32 Oz Sqeeze bottle in. I added about 5 oz's to my 26 gallon tank. I keep a Very close track of my MPG. Last Time On my 05 Ram 4.7L. I managed to get 18MPG Which includes driving on moutainous terrain. I'll post back in this thread once I check out the next 2 tanks and average the MPG. If it turns out pretty good I'll prob order a gallon. If not then I'll just have to go from there and see.