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Filling Up Full Tank Adds Unnecessary Weight Thus Reduces Mpg.
GAS weighs 8lbs a gallon.
Weight reduces gas mileage. So i would think it is best to drive with as little gas in the tank as possible. LEts say you have a 12 gallon tank and fill up to full tank.That fuel weighs 96lbs...If you fill up with only 4 gallons youve just reduced your weight by 64lbs. Thoughts? |
There is a point of diminishing returns because of the increased trips to the gas station.
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You could fill up, then siphon most of it out and keep it in jerry cans, adding it back to the tank as needed. :)
Sure, weight savings are good. The impact of removing 64 lbs will be very, very small (too small to detect in your fuel consumption log), but it's real. Also, I thought gas was closer to 6 lbs per US gallon... |
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Some of you have seen this before, or an earlier copy of it.
This is my daily commute, over the last 1.5 years. 500+ data points. 125% (above full on the gauge) and 1% (empty / low fuel light) both have 1/3 as many data points as the others. My car stumbles / sputters a bit when it gets low, but still has fuel. I haven't run it dry yet. I may need to fix something there. I have an 11 gallon tank. Q3 is the 75th percentile, or halfway from average to max. Q1 is the 25th, or halfway from average to min. The linear portion (25%-125%) of the mean chart calculates out to about 0.5% decrease per gallon added. http://forum.ecomodder.com/attachmen...0&d=1211486767 Attachment 780 |
yes you are right...it does weigh aprox 6lbs.
I thought it was the same as water. http://www.santacruzpl.org/readyref/...gasoline.shtml |
That is a really interesting graph. You average over a 2 mpg increase riding with a 1/4 tank vs. a full tank. It makes sense but, it is cool to see a graph of the mpg.
Just seeing that graph makes me want to do some weight reduction. |
What can account for the drop from 25% -> 1% ?
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Updated the post above, but:
My car sputters and really doesn't want to start/restart when it's low. I do a lot more engine-on coasting and leave it running at stops instead of shutting down. There's still fuel available, but there's something it doesn't like. It's probably an issue with my car. |
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I don't know. It shouldn't be that large a difference, but there it is. My strategy now is to run it low, but not quite to empty.
I did notice after filling up this morning, my glide points were off - rolling farther from the same starting speed. I do LOTS of P&G, so maybe the weight difference is more relevant there. I like your idea of siphoning out gallons and then adding them back later. :D |
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