Dang, such tanks are expensive no matter which way i go.. I just want the extra fuel for a big trip or two a summer.. And the 25-28 gallons i have now kill me. Plus i don't like to run below a 1/4 tank while traveling for fear of reaching a fuel stop. So i piddle around with 15-20 gallons while traveling. At 10-12 mpg pulling the 5vr, That has me stopping freguently causeing 20 minute everytime to fill up and almost 2 hours of downtime on the trip just getting from buffalo to myrtle beach, lets say.

If i got a 40 gallon aux tank. That would take me all the way to my overnight stay when i stop anyways. with a total of 65 gallons onboard i wouldn't need to stop to fill up solely plus my stress level would be less. Total trip is around 850 miles so i need around 70-80 gallons. But i don't do the trip all in day.