Fuel fill-up mystery
#61
More on mileage
New member, this thread is interesting, even though it occasionally goes way off topic. Back to the quote above from Xtal5:
It's true, your fuel mileage has very little to do with how frequently you stop for gas. I say very little, because it WOULD affect mileage if you took it to ridiculous limits - ie. if you filled up, drove 2 miles and returned for more gas every 2 miles of driving. All those stops and starts would adversely affect mileage. But lets be reasonable and figure you aren't buying gas until the tank is half full or less. That would have negligible impact on your fuel economy. It would increase the amount of time you spend filling up is about all. More fillups equals more time.
What does affect mileage is driving habits (most important of all), automatic vs. manual tranny, tire pressure, type of tire, speed, ambient temperature, weather (heavy snow vs. sunny and dry), altitude above sea level, engine tune, air filter new or clogged, oil (dino vs. synthetic), road conditions such as flat, hilly or curvy and whether windows are open or closed, and accessories like A/C, fan, etc. on or off.
Lastly, I noticed a bit of misinformation in this thread. Yes, when you refuel your car, some gas vapors escape into the atmosphere. Refueling more often will NOT cause more vapors to escape. Some states have laws requiring a special vapor recovery system with an accordian pleated rubber device which sucks the vapors escaping from your tank back to the gas station's tank.
Many states do NOT have such laws and the gas pump nozzle is plain old steel tubing. In those states, the frequency of filling up has almost nothing to do with how many vapors escape. What does matter is how many gallons you put in the tank. If you put ten gallons in, you displace twice as much vapor than if you put 5 gallons in, it's simple math. Nothing at all to do with how often you buy gas.
When the tanker truck fills the underground tanks, they use a vapor recovery system, so as the truck empties, it's filled with the vapors escaping from the underground tanks. Those vapors are hauled back to the fuel depot, where they in turn go into the depot tank as the tanker truck is refilled. It's a theoretically closed system, better for the environment. At least this covers about 2/3 of the vapors released in the whole process, except for the vapors from your cars tank in the states without recovery laws. I realize I only brought us back to the fuel depot, not to the refinery just to keep things simple
#62
************************************************** *
New member, this thread is interesting, even though it occasionally goes way off topic. Back to the quote above from Xtal5:
It's true, your fuel mileage has very little to do with how frequently you stop for gas. I say very little, because it WOULD affect mileage if you took it to ridiculous limits - ie. if you filled up, drove 2 miles and returned for more gas every 2 miles of driving. All those stops and starts would adversely affect mileage. But lets be reasonable and figure you aren't buying gas until the tank is half full or less. That would have negligible impact on your fuel economy. It would increase the amount of time you spend filling up is about all. More fillups equals more time.
What does affect mileage is driving habits (most important of all), automatic vs. manual tranny, tire pressure, type of tire, speed, ambient temperature, weather (heavy snow vs. sunny and dry), altitude above sea level, engine tune, air filter new or clogged, oil (dino vs. synthetic), road conditions such as flat, hilly or curvy and whether windows are open or closed, and accessories like A/C, fan, etc. on or off.
Lastly, I noticed a bit of misinformation in this thread. Yes, when you refuel your car, some gas vapors escape into the atmosphere. Refueling more often will NOT cause more vapors to escape. Some states have laws requiring a special vapor recovery system with an accordian pleated rubber device which sucks the vapors escaping from your tank back to the gas station's tank.
Many states do NOT have such laws and the gas pump nozzle is plain old steel tubing. In those states, the frequency of filling up has almost nothing to do with how many vapors escape. What does matter is how many gallons you put in the tank. If you put ten gallons in, you displace twice as much vapor than if you put 5 gallons in, it's simple math. Nothing at all to do with how often you buy gas.
When the tanker truck fills the underground tanks, they use a vapor recovery system, so as the truck empties, it's filled with the vapors escaping from the underground tanks. Those vapors are hauled back to the fuel depot, where they in turn go into the depot tank as the tanker truck is refilled. It's a theoretically closed system, better for the environment. At least this covers about 2/3 of the vapors released in the whole process, except for the vapors from your cars tank in the states without recovery laws. I realize I only brought us back to the fuel depot, not to the refinery just to keep things simple
New member, this thread is interesting, even though it occasionally goes way off topic. Back to the quote above from Xtal5:
It's true, your fuel mileage has very little to do with how frequently you stop for gas. I say very little, because it WOULD affect mileage if you took it to ridiculous limits - ie. if you filled up, drove 2 miles and returned for more gas every 2 miles of driving. All those stops and starts would adversely affect mileage. But lets be reasonable and figure you aren't buying gas until the tank is half full or less. That would have negligible impact on your fuel economy. It would increase the amount of time you spend filling up is about all. More fillups equals more time.
What does affect mileage is driving habits (most important of all), automatic vs. manual tranny, tire pressure, type of tire, speed, ambient temperature, weather (heavy snow vs. sunny and dry), altitude above sea level, engine tune, air filter new or clogged, oil (dino vs. synthetic), road conditions such as flat, hilly or curvy and whether windows are open or closed, and accessories like A/C, fan, etc. on or off.
Lastly, I noticed a bit of misinformation in this thread. Yes, when you refuel your car, some gas vapors escape into the atmosphere. Refueling more often will NOT cause more vapors to escape. Some states have laws requiring a special vapor recovery system with an accordian pleated rubber device which sucks the vapors escaping from your tank back to the gas station's tank.
Many states do NOT have such laws and the gas pump nozzle is plain old steel tubing. In those states, the frequency of filling up has almost nothing to do with how many vapors escape. What does matter is how many gallons you put in the tank. If you put ten gallons in, you displace twice as much vapor than if you put 5 gallons in, it's simple math. Nothing at all to do with how often you buy gas.
When the tanker truck fills the underground tanks, they use a vapor recovery system, so as the truck empties, it's filled with the vapors escaping from the underground tanks. Those vapors are hauled back to the fuel depot, where they in turn go into the depot tank as the tanker truck is refilled. It's a theoretically closed system, better for the environment. At least this covers about 2/3 of the vapors released in the whole process, except for the vapors from your cars tank in the states without recovery laws. I realize I only brought us back to the fuel depot, not to the refinery just to keep things simple
So it's not really about saving the fuel or environment, although that is a secondary benefit they promote.
So rather than saving fuel, the vapor recovery primarily seems to be a safety feature to exchange volumes of fluids, so you don't have displaced volatile vapor being outgassed in a concentrated stream, and avoid your customers smelling like gasoline.
Last edited by raytseng; 04-26-2011 at 02:02 PM.
#64
Today I filled up with 9.69 gallons, about 2 miles after the light came on. This would mean only a 1 gallon capacity after the light- not what Honda says.
Assuming the light runs off of the gas gauge, and knowing that gas gauges are notoriously innacurate in general, I wouldn't think of their numbers as a guarantee.
Assuming the light runs off of the gas gauge, and knowing that gas gauges are notoriously innacurate in general, I wouldn't think of their numbers as a guarantee.
Anyone looking to stop for gas less often might be interested in this info. This tells me I'm easily good to drive 50 miles after the light comes on. 1.7 gallons times 37 mpg = 62.9 miles which provides a safety cushion.
#65
Did you pay extra to have a needle on your odometer? I only have a needle on my fuel gauge, speedo, tach, etc. My odometer is plain Jane digital. I would love to see an odometer needle, sounds really cool
Just havin' fun...
All kidding aside, I've noticed when I fill my Fit to the brim, the fuel gauge stays a couple needle widths above full mark for quite a few miles. Now that you comment on it, I'll have to notice how many miles to get down to Full mark. I've owned many cars which take a lot longer to go from Full to Half, than they take to go from Half to Empty. I'm guessing car makers do that to reduce the chance you'll run out of gas. Once you notice the gauge dropping rapidly you're more likely to stop for gas.
#66
Hey T.C.,
Did you pay extra to have a needle on your odometer? I only have a needle on my fuel gauge, speedo, tach, etc. My odometer is plain Jane digital. I would love to see an odometer needle, sounds really cool
Just havin' fun...
All kidding aside, I've noticed when I fill my Fit to the brim, the fuel gauge stays a couple needle widths above full mark for quite a few miles. Now that you comment on it, I'll have to notice how many miles to get down to Full mark. I've owned many cars which take a lot longer to go from Full to Half, than they take to go from Half to Empty. I'm guessing car makers do that to reduce the chance you'll run out of gas. Once you notice the gauge dropping rapidly you're more likely to stop for gas.
Did you pay extra to have a needle on your odometer? I only have a needle on my fuel gauge, speedo, tach, etc. My odometer is plain Jane digital. I would love to see an odometer needle, sounds really cool
Just havin' fun...
All kidding aside, I've noticed when I fill my Fit to the brim, the fuel gauge stays a couple needle widths above full mark for quite a few miles. Now that you comment on it, I'll have to notice how many miles to get down to Full mark. I've owned many cars which take a lot longer to go from Full to Half, than they take to go from Half to Empty. I'm guessing car makers do that to reduce the chance you'll run out of gas. Once you notice the gauge dropping rapidly you're more likely to stop for gas.
I had a Mazda van that ran out when the fuel guage got to the end of the empty block. Happened the day I bought it. Car dealer gave it to me empty and having always found some reserve on other vehicles I figured I could fill it up at a convenient station on the way home only I didn't quite make it.
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