Quick story, several years ago my neighbor and I went to Thompson racing for a clinic event with the junkman they did a 50/50 for a 5 gallon detail spray. I wanted to win that in the worst way, well my neighbor hits he still has it and it will probably last him a life time. My point 5 gallons is to much unless you detail for a living, 1 gallon is the way to go. Soaps, APC and detail you will burn through for me I need to catch a sale and get free shipping and it's a no brainier.