I had one last about 11 hours. Fixed it on the side of I-5 because I still had the old one in the back of the truck. They replaced it but when I put the new one in I forgot to hook up the sending unit wires so I thought I was getting 88 miles to the gallon until it ran out of gas. (dam). Dropped the tank on the side of the road again and realized my stupidity. Real hot gal gave me a ride to the gas station and then took me to her business to clean up the dirt and grime off my face, about half a block. Last thing she said was, "wow you clean up GOOD! Now if you'll excuse me I have to meet with my staff."
Always remember the difference between psi, and volume. Low psi wont have much of an effect, but low volume will drop the rpm's more significantly.