gas tank stuff
#1
gas tank stuff
over the last 5 days i had to take 2 road trips, both about 4 hours roundtrip. the first one was me alone, windows down, 80% of it at 70-75mph. the second trip was 2 people, windows up, ac on, 85-90% at 70-75. i averaged 24.4 mpg on the first trip, second trip was 24.3.
now the strange part... both times i got over 200 miles on the first half of the tank and only around 150 on the second half.i really can't figure out what happened. i have made the same trips on both of my other cars and they were both normal, meaning i got just as many miles from the first half as the second half of the tank. what gives?
now the strange part... both times i got over 200 miles on the first half of the tank and only around 150 on the second half.i really can't figure out what happened. i have made the same trips on both of my other cars and they were both normal, meaning i got just as many miles from the first half as the second half of the tank. what gives?
#3
#4
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RE: gas tank stuff
all depends what you call half a tank.. if you are reading the needle then accept that it is an analog gauge and uses a float.. it all depends on how it is calibrated.
I am sure that the engine is using the same amout of fuel per mile throughout the tank. .. just an indicator problem.
I am sure that the engine is using the same amout of fuel per mile throughout the tank. .. just an indicator problem.
#5
RE: gas tank stuff
The gas tank is probably shaped like a V so it will seem to last longer before half a tank then it will quickly run out once you get past the half way mark. Is your car throwing any codes? Did you clean the injectors? Oil changes up to date? Tires properly inflated? New filters? All these variables effect your mpg.
#7
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RE: gas tank stuff
As per rivs.........they covered this in top gear when they drove the Audi A8 from London - Edinburgh - London on one tank of gas. A total of 800 miles.
He did mention about the "extra" fuel in the neck of the tank that is essentially unaccounted for. Obviously you can only use this once
You're always gonna get more outta the first "half" tank than you will the second "half"
JC
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#8
#9
RE: gas tank stuff
nope racer, i never squeeze any extra in. when it stops, it stops. no need to risk having expensive gas fall out all over my cars. i guess you missed the part where i said the milage was .10mpg difference between the 2 tanks. i was talking about the actual milage.
rivs - i can understand there is a bit of extra in the fill tube, but 2+ gallons worth? that idea doesn't fly with me.
peewee - yes those things are all checked regularly, but there is no way they could have been a factor considering i did the first trip on thrusday/friday and the second trip saturday/sunday. just not enough time for any of those items to change the milage that much.
i guess i will chalk it up to the float needle being somehow slightly off on it's calibration. it did show the exact same results on both tanks, so it is reading correctly, just not completely correctly.
rivs - i can understand there is a bit of extra in the fill tube, but 2+ gallons worth? that idea doesn't fly with me.
peewee - yes those things are all checked regularly, but there is no way they could have been a factor considering i did the first trip on thrusday/friday and the second trip saturday/sunday. just not enough time for any of those items to change the milage that much.
i guess i will chalk it up to the float needle being somehow slightly off on it's calibration. it did show the exact same results on both tanks, so it is reading correctly, just not completely correctly.
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#14
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#15
RE: gas tank stuff
They did a test on mythbusters and the suv with the windows open actually lapped around the track a couple of more times as the one with ac on ran out of gas...although the computer information they gathered said that the actual result should be that windows up and a/c on in mainly highway is actually better than windows down...those results were concluded by taking in the air mixture and all that stuff into their computers but on the track with identical suvs the one without a/c on kept running...I'll keep using my a/c when it is over 80 degrees though so either way it doesn't matter...gotta keep the baby from sweating back there!
Nineball-I've noticed this with both of my vehicles and vehicles in the past...I just figured that it isn't an exact science and would rather just keep track of total mileage...The jag gets more mpg the first half and less the second half like you...
Nineball-I've noticed this with both of my vehicles and vehicles in the past...I just figured that it isn't an exact science and would rather just keep track of total mileage...The jag gets more mpg the first half and less the second half like you...
#16
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#18
RE: gas tank stuff
I remember reading this thread a long while back.
I was reminded of it the other day when my X ran out of gas on the highway. I've coasted on fumes plenty of times before in the past, but always with a conscious effort to see how far a car could go before the tank is truly empty (and I've never actually pushed it past the breaking-point).
I don't know what happened Monday morning, but I never even noticed that the orange light was on signalling to me that my tank had been empty (apparently for some time). I was smack in between two exits about 3 miles apart from one another when the throttle just gave-out, and then the 'check-engine' type lights turned on and I coasted to a stop. LOL!
Oh man. Note to Self: "When the gas-gauge is pointing to the last tick-line next to the E, it really IS empty."
I hate Mondays.
I was reminded of it the other day when my X ran out of gas on the highway. I've coasted on fumes plenty of times before in the past, but always with a conscious effort to see how far a car could go before the tank is truly empty (and I've never actually pushed it past the breaking-point).
I don't know what happened Monday morning, but I never even noticed that the orange light was on signalling to me that my tank had been empty (apparently for some time). I was smack in between two exits about 3 miles apart from one another when the throttle just gave-out, and then the 'check-engine' type lights turned on and I coasted to a stop. LOL!
Oh man. Note to Self: "When the gas-gauge is pointing to the last tick-line next to the E, it really IS empty."
I hate Mondays.
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