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Old 08-23-2006, 04:21 AM   #1
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Weight reduction: not filling the gas tank

Quote:
Originally Posted by MetroMPG

As Dan knows, you can gain an equivalent weight advantage by just not filling your tank above half way.
Yup, about 6 lbs per gallon IIRC. When not calibrating the SuperMID, I only have 6 gallons max in my 11ish gal tank. That is about 30 pounds savings. I also have my windshield washer solvent at 1/2 tank max.
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Old 08-23-2006, 06:05 AM   #2
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Quote:
Originally Posted by krousdb
Yup, about 6 lbs per gallon IIRC. When not calibrating the SuperMID, I only have 6 gallons max in my 11ish gal tank. That is about 30 pounds savings. I also have my windshield washer solvent at 1/2 tank max.
I love it. Are you running half-tanks now, or are you still calibrating the MID with the VX?

I think 6lbs/gal is what I turned up most in a recent search I did as well. Which actually makes fuel the single heaviest easily "removable" item on my car. 10.5 gal tank = 63 lbs. Spare & jack = 24. Passenger seat = 29.
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Old 08-23-2006, 06:13 AM   #3
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Quote:
Originally Posted by MetroMPG
I love it. Are you running half-tanks now, or are you still calibrating the MID with the VX?

I think 6lbs/gal is what I turned up most in a recent search I did as well. Which actually makes fuel the single heaviest easily "removable" item on my car. 10.5 gal tank = 63 lbs. Spare & jack = 24. Passenger seat = 29.
how much difference does 30lbs really make??

for what its worth, i skipped breakfast this morning. figure it was worth a couple of pounds.
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Old 08-23-2006, 07:28 AM   #4
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Quote:
25 lbs may represent a fuel economy difference of about 0.25% - 0.5% based on the oft quoted figure of a 1-2% fuel economy penalty for every extra 100 lbs carried (EPA).
The difference is likely too small to measure reliably with FE instrumentation in a test scenario. But it's real, and every little bit helps.

However, this kind of discussion is probably an example of how we apparently cultivate the impression we're Screwballs.
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Old 08-23-2006, 09:58 AM   #5
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Quote:
Originally Posted by MetroMPG
I love it. Are you running half-tanks now, or are you still calibrating the MID with the VX?.
I'm calibrated and running half tanks now. Can't say it it makes a difference. Can't hurt though.
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Old 08-23-2006, 10:09 AM   #6
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Is dan back from retirement? Retirement meaning the beach.
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Old 08-23-2006, 12:10 PM   #7
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I make up for full filling my by just running it 50 miles after the fuel light comes on!
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Old 08-23-2006, 12:13 PM   #8
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Modern cars are supposed to have closed systems. No fuel should evaporate to the outside, so you don't "lose" anything. Fumes are combusted via the evaporative emissions controls.
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Old 08-23-2006, 12:17 PM   #9
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I just go from F to E. I fill it up till it clicks (so I can track my mpg) and then ride till E (aprox. 9-10gal). If I do half fills it throws off the whole one click fill up thing.
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Old 08-23-2006, 12:17 PM   #10
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The only thing I've heard about too little gas is from lubedev/smartgas. He claims that all the water in that air will collect in gas and ruin your mileage! Logical, no?
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