The other thing which most people don't think about is how much your fuel economy suffers if you installed a 90gal tank in the bed. That's a lot of weight to be dragging around. Not so much an issue on the hwy but in city stop/go traffic it's a huge fuel hog to get that weight rolling at each light.
If it was water (diesel is lighter) 90gal would be 340L or about 750lbs. No chump change there.
In that regard, the manufacturer has to make some concessions as well. If the tank is too large EPA fuel economy goes down, they don't want that either.
All true, but misses the bigger point: There's nothing that says you have to keep it full when driving around town. I don't. I only drive with it full on long trips. It's nice being able to drive from North Alabama to Pittsburgh and back without having to buy fuel, if I choose not to.
It's all about choice. 30/35/38 gallon tanks don't give you as much choice.
In fact, I was looking at the options on tanks last week. There were a few ads in the diesel magazines I bought.
Also great for filling up south of the border (cheap fuel), however, Canada customs has the right to ding you taxes on the fuel that's in your auxiliary tank (that's why you buy the one that looks like a tool box!) [img]/forums/images/%%GRAEMLIN_URL%%/smile.gif[/img] . If it's not factory-installed you can get taxed. Don't try filling up one of those red Tidy-Tanks and expect to get away with it. Food for thought.
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