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Auxiliary diesel fuel tank Yea or nay

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I have a 115 gallon auxiliary|spare tank in the bed of my 1995 F250 diesel. I love it. Gives me a 1,700 mile range with a good safety cushion. Makes no difference in my fuel mileage if it is full or not. I track every fill up to keep watch on my trucks. The truck rides a lot nicer with the extra 1000.lbs in the bed. I have it on an electric fuel pump that runs to my rear tank. Flip switch, fills tank, then shut off. Don't have to stop. I also have an electric pump nozzle to fill equipment. I would be willing to bet I save fuel by not needing to stop, then get back up to speed again. Throw in my list time and it's a no brainer. I would recommend filtering the fuel w| water separator as soon as possible when it leaves the tank. Diesel injection systems get expensive very quickly. 5 gallon can a messy as heck. Especially with the "smart" spouts that I remove and end up dumping straight from the ca. Then you have the funnel to deal with with diesel all over it. You get the point.
The only thing I am missing is a gauge to show me how much fuel is in aux tank. I use a wood broom handle and tracking milage has worked for 325,000+ miles on that truck.
 
I think the big 3 offer larger tanks on their 8' beds. I've got a Ram with the 50 gallon tank. Best 300.00 option you can buy. Increased my range by more than 50%.
 

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