Empty gas tank = less gas mileage ??

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quote:

Originally posted by surfstar:
Matt_S you mean the one with the homemade "tornado" and engine ionizer?

#72 has 5 paragraphs.
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Oh my G0D, no! Mine will be showing up after #76. They moderate all the entries, which makes it even more pathetic that there's such bad advise there.
 
The only reason I ever heard for not running the tank dry was the possibility of burning up the fuel pump. In tank pumps are cooled by fuel. I suppose that you could make an issue out of mileage because of the weight of hauling around a full vs. empty tank. I wouldn't think the weight of a full tank would affect mileage much but it would be some.
 
Johnd, fuel pumps are cooled by the fuel running THROUGH them, not by the fuel around them. If you make it a habit of running out of gas, you can definitely burn up a fuel pump. Running the tank low will not cause a problem.
 
quote:

Originally posted by Dark Jedi:
I always heard not to let your tank run under a quarter tank. as all the dirt and stuff that could be in there. can get sucked up by the pump quicker and clog your fuel filter. is this true or like the above false.

The fuel pump suck from the same place no matter if the tank is full or almost empty, so this is not true.
 
quote:

Originally posted by JAYCEE:
Going under a 1/4 tank increases condensation in the fuel tank. This moisture can cause problems in the fuel system.

I stay above 1/4 tank, unless on a road trip.


With as many miles as I drive, if I filled up between 1/4 and 1/2 I'd fill up every 1.5 days. I think the condensation problem could be an issue if cars aren't driven many miles, but in my case, it never has a chance. So, I fill up as close to "E" as possible!

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quote:

Originally posted by surfstar:
Its a bunch of random crap from people posting their own "tips". Some good, some bad.

Another person stated they only fill their tank between 1/4 and 1/2 to save weight and therefore gas - doens't the idiot realize that by driving to the gas station 2-3 times as often he's wasting gas.


He might not have to drive "to" the gas station...might be just a pull-off on his regular route...still, point taken...
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quote:

Originally posted by surfstar:
Another person stated they only fill their tank between 1/4 and 1/2 to save weight and therefore gas - doens't the idiot realize that by driving to the gas station 2-3 times as often he's wasting gas.

Maybe he doesn't have to drive "to" the gas station...may be just a pull-off on his regular route. Still, point taken, and I don't think he's really helping his cause.
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I like these ones from "Randy G"

1) if possible, install a fuel cooler. (it's like a mini-radiator but for fuel). True, gas is more dense when its cool, so the more you can keep it cool, the better.
Huh? Maybe my car is different but my fuel never seems to be boiling... lol

5) Run higher octane gasoline such as 89 or 93. Higher octane fuel burns slower than lower octane, thus saving gas.
Wouldn't octane be the fuel's resistance to premature combustion?
 
quote:

I always heard not to let your tank run under a quarter tank. as all the dirt and stuff that could be in there. can get sucked up by the pump quicker and clog your fuel filter. is this true or like the above false.

Well, isn't the fuel filter there to catch "dirt?" How much dirt are people putting in their gas tanks anyway.

I just changed the fuel pump on my wife's Lumina. I had heard the dirt and gunk spiel, too. So, when I looked in, I was surprised at how prisine the tank was. The only dirt was on the outside.....

I did see some random metal shavings-looking objects on the bottom near where the pump picks up (I was surprised to see the baffles in the tank made of yellow plastic), but I assume that the strainer stops those from even getting to the pump, much less the filter.
 
quote:

Originally posted by Matt_S:

quote:

Originally posted by mechtech:
Also, most gas has alcohol in it, which absorbs any water and passes it though.

Methanol will do that, but not ethanol. Someone posted a link a week or two ago to a site that sells instructions on how to home-brew ethanol. They stated quite clearly that unless you can make 200 proof ethanol, you can't mix it with gas, as the water will separate out of the mixture. There are ways of removing the 5% or so of water that you can't distill out, but if you get water in your tank, you need methanol, which is the main ingredient in gas line antifreeze.


This is not completely true. Ethanol with absorb water. Most manuals say not to use methanol in your gas because it is so corrosive. The stuff in most gasline antifreeze is isopropyl alcohol. The original yellow heet bottles contained methanol.
 
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