fuel gauge accuracy, is empty really empty? - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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post #1 of 44 (permalink) Old 02-22-2014, 12:44 PM Thread Starter
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fuel gauge accuracy, is empty really empty?

I'd like to know before I have to find out the hard way how much emergency gas reserve is left when the gauge reads empty. Has anyone taken their car past three last led blip on the gauge? How far have you pushed it? Or is E really E on this car?

Also curious how accurate the "miles left" counter is. When it hits zero, is that really 0?
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post #2 of 44 (permalink) Old 02-22-2014, 01:15 PM
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I've hit 2 of the little "blips" left and the fuel light went on. I wasn't willing to risk it past that



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post #3 of 44 (permalink) Old 02-22-2014, 01:56 PM
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I've been down to 2 segments as well, according to my records I put in 14.07 gallons in that fill. Looks like the gas tank is 16.4 gallons. Unfortunately I don't know what the range was at that point.
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post #4 of 44 (permalink) Old 02-22-2014, 01:59 PM
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I've went all the way down to 0 blips left and the car saying "0 miles to empty". From what I've read you have about another 10-15 miles left of gas at that point. I've did it twice and have been okay, even driving to work turning the car off and coming back and turning the car on and making it to the gas station.

but...

DONT DO WHAT I DO...I'm probably messing something up.

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post #5 of 44 (permalink) Old 02-22-2014, 02:00 PM
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My experience suggests that empty really isn't empty. Returning from NYC last summer I planned on filling up in NJ (cheaper than NY). Right after getting off the GWB my miles to empty read 11 so I stopped within a couple of miles at the first available and filled. Car only took like 14 gallons so it clearly had 2-3 remaining. My subsequent fill ups under similar circumstances have been the same. I thinks it's fair to say that the miles to empty number under reflects the gas in the tank by two or more gallons.
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post #6 of 44 (permalink) Old 02-22-2014, 02:17 PM Thread Starter
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I just took it to 0 and was afraid to go more than another mile or two, but it made it.
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post #7 of 44 (permalink) Old 02-22-2014, 03:40 PM
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Plenty of gas in the tank even after zero bars
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post #8 of 44 (permalink) Old 02-22-2014, 03:41 PM
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Quote:
Originally Posted by toecheese View Post
I just took it to 0 and was afraid to go more than another mile or two, but it made it.
Did you fill it to determine how much was left in the tank.
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post #9 of 44 (permalink) Old 02-22-2014, 05:47 PM
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Manufacturers always design the gas gauge to be conservative. Owners manuals of cars I've had in the past have indicated that you have anywhere from 25 to 50 miles left once the gas gauge hits empty.

Not sure if there's a legal reason why they do this, but yeah, empty is not really empty.
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post #10 of 44 (permalink) Old 02-22-2014, 08:20 PM
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That may be the design but....

(I have a Suburban that has developed a wee problem -- it's actually OUT when it reads 1/4. And yes, it's really out...... as you will discover if you try to run it down beyond that.)
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