Download a free app to record your gas consumption/mileage. I've been doing this since buying the Z (manually recorded the fuel economy since '84, yes I'm anal retentive) and find the fuel economy pretty consistent. If your driving habits don't change, then you could accurately guess how many miles/tank to expect. I can stretch it out to 400miles/tank, but fill up before 385, after that, beads of sweat start forming on my forehead, not to mention my wife just itching to say "I told you so".
The most I've put into the tank in one fill up was 18.999gallons. All asteriks on the distance to empty, no dots on the fuel gauge and lots of worry (completely miscalculated our next pit stop on the way to Vegas from Reno). But we made it... wahoo!
I've never been one to believe not to let the tank get too low. Each tank is drained as far as I can and never had a problem with water in the tank, sediment or fuel pump issues. Doing this since the 80's. Not sure if it has anything to do with the oil company I use, but would confidentally say over 99% of the gas I've used has been from Shell. No, I'm not an employee of Shell, just found the vehicle was getting better gas mileage whenever I used their gas (see first paragraph about being anal retentive), and have never tried anything else since.
my 2cents.
Cheers
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Thought for the Day:
My wife just stopped and said, "You weren't even listening, were you?"
I thought, "That's a pretty weird way to start a conversation."
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