Need advice on Aux Fuel Tank

I was concerned about the added weight of an in bed tank so decided to go with a Titan 57 gallon replacement tank. It only increases my capacity by 21 gallons but allows me to go about 500 to 550 miles. We are usually stopped by then as I like to go about 400 miles or so a day. Then I just find a local station and fill up unhooked. All the info displays, including the fuel gauge, work except for the miles to empty. A little more pricey for what you get but I got to keep all my bed space. I found mine on sale for a little over $900 and installed it myself. Took me about 4 hours and I am a little mechanically challenged. Titan has very good instructions and a really good tech service.