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My quest for 30 MPG - Ford Explorer Gas Mileage Tips

Discussion in 'Hybrids, Electric, Hydrogen, Bio-diesel, E-85, Fue' started by aldive, February 24, 2002.

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    1. Centaurus5.0

      Centaurus5.0 Elite 5.0L Fiddler Elite Explorer

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      Yes, please.

      Ford specs the 93's as 19.3 gallons. Fuel pump wouldn't displace more than 20oz.

      It would be refreshing to get a straight answer.
       
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    3. Mbrooks420

      Mbrooks420 High Voltage. Elite Explorer

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      With the irregular shape of the tank I doubt you'd get a tight enough measurement to extrapolate to volume. There's also baffles, and the fact the truck would have to be sitting just right to be able to get it full without an air bubble.
       
    4. Centaurus5.0

      Centaurus5.0 Elite 5.0L Fiddler Elite Explorer

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      Seeing how much water will fit using an empty gallon milk jug on level ground would work for me. If he wants to rock the tank to get out bubbles when it almost full to back up his argument is fine with me even though the factory states not to "top off" when filling in the manual.

      This entire 87 page thread is moot without knowing exactly (or even approximately) how much fuel the tank can hold. How can you empirically calculate a mpg otherwise?

      I have filled up and run my trucks completely out of fuel in the past to gauge mpg (using non-ethanol mixed fuel) assuming (foolishly?) the capacity is 21 gallons as the factory says it is.

      From the observation I shared earlier, even when topping off to maximum capacity, I don't see more than 21 gallons. there's not another 1-5 gallons left in the tank when the gauge is below "E" and the truck is sputtering on hills.

      The irregularities in shape on top of the tank are for venting and expansion and not calculated for capacity.

      Same with the rest of the fluid systems on cars. Put in more than designed capacity and bad things happen.

      To state "all big Fords gas tanks are 22 gallon", would mean he measured all the different tanks from all the cars (including functional void space?) even though the manuals all give different numbers, even if slightly, is ignorant.
       
      Last edited: September 19, 2017
    5. Mbrooks420

      Mbrooks420 High Voltage. Elite Explorer

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      The thread isn't at all worthless. The tanks volume is entirely irrelevant. You would NEVER get any sort of accurate number using a tanks volume. The gas pumps readout would be at least 20 times more accurate than your guesstimate on what fractional value volume of your tank you've replaced.
       
    6. Centaurus5.0

      Centaurus5.0 Elite 5.0L Fiddler Elite Explorer

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      [​IMG]

      Okay then. It's a 21 Gallon tank.
       
    7. Mbrooks420

      Mbrooks420 High Voltage. Elite Explorer

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      Did you run it flat empty? I'm Also sure the tanks vary more than the gas pumps do.
       
    8. CDW6212R

      CDW6212R Hauls the mail. Elite Explorer

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      I'll dig up my old pictures, one showing the 17 gallon 99 Sport tank, next to my 93 22 gallon tank.

      I don't recall the actual words I used to describe my many big Fords that I've driven. But I put a bunch of miles on almost all of them, and basically drive every vehicle to near empty. I try to avoid filling often, it saves a little time to not fill up twice at the half way mark, versus once when about empty. So maybe some people see a big gallon number rarely when they find they went too far by accident. I basically carefully gauge how far I can go on each tank of gas, for all cars I drive, and try to get near empty before hunting a gas station.

      So I'm sorry if the various manuals for each car I've owned don't all say they're 22 gallons. But they are all very very close to it. Here's my past cars list for reference;
      1972 Gran Torino, 2dr, 351C-2V, bucket seats, my first car, and my parent's only car bought new.
      1972 Ranchero
      1973 Ranchero
      1986 Crown Vic
      1985 Crown Vic
      1991 Lincoln Mark VII
      1985 Lincoln Mark VII
      1991 Explorer 4dr
      1990 Lincoln Mark VII
      1993 Explorer 4dr
      1991 Lincoln Mark VII
      1995 Crown Vic
      1995 Crown Vic
      1998 Mountaineer
      1999 Explorer 4dr
      1998 Explorer 4dr

      I used to keep a log of all gas fillups and all maintenance, a little book for each in the glove box. I didn't start one for my current 98 Limited, but I will soon. I still have some of those log books, and they show my countless gas amounts, most near 20 gallons, and near 22 in every vehicle. That's my unscientific conclusion that the gas tank is closer to 22 gallons than any manual, experience.
       
    9. CDW6212R

      CDW6212R Hauls the mail. Elite Explorer

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      I found two pictures of the old 93 4dr tank, and my 98 Mercury tank. The steel tank is way longer, but the plastic one has more width internally, and they both hold the same amount. I'll look some more for the 99 Sport tank I bought, I also got the skid plate from a Sport, and the 93 4dr tank is a perfect fit on that short skid plate.

      93-98 4dr tanks width.JPG

      PICT2916.JPG
       
    10. Centaurus5.0

      Centaurus5.0 Elite 5.0L Fiddler Elite Explorer

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      Ah yes! They DO both hold the same amount (22 gallons). That fact is glaringly apparent now that I see them both side by side.:rolleyes:

      :laugh:
       
    11. CDW6212R

      CDW6212R Hauls the mail. Elite Explorer

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      They do both hold the same amount. I know the picture doesn't make it appear that way, but they do.
       
    12. Centaurus5.0

      Centaurus5.0 Elite 5.0L Fiddler Elite Explorer

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      Here is a good read..

      https://cumminsengines.com/uploads/docs/cummins_secrets_of_better_fuel_economy.pdf


      Rock Solid Rules to MPG

      • Every 2% reduction in aerodynamic drag results in approximately 1% improvement in fuel economy.
      • Above 55 mph, each 1 mph increase in vehicle speed decreases fuel economy by 0.1 mpg
      • Worn tires provide better fuel economy than new tires, up to 7% better fuel economy.
      • Used lug drive tires can get up to 0.4 mpg better than new lug tires
      • Ribbed tires on the drive axles provide 2–4% better fuel economy than lugged tires.
      • Every 10 psi that a truck’s tires are underinflated reduces fuel economy by 1%.
      • The break-in period for tires is between 35,000 and 50,000 miles.
      • Tires make biggest difference in mpg below around 50 mph; aerodynamics is the most important factor over around 50 mph.
      • The most efficient drivers get about 30% better fuel economy than the least efficient drivers.
      • Idle time is costly. Every hour of idle time in a long-haul operation can decrease fuel efficiency by 1%.

      Weather and Seasonal Conditions
      You can’t control the weather or the seasons, but they definitely affect your fuel economy. Running only on sunny days with moderate temperatures is very impractical, but you have to take the weather and seasonal variations into account when checking fuel economy.

      Ambient Temperature
      Air becomes more dense as temperatures drop, which increases air resistance. For every 10°F drop in temperature, aerodynamic drag increases by 2%. Thus, fuel efficiency will drop by 1%. Overall, fuel economy tends to be higher in the summer than the winter. According to North American Truckload Fleet Data, driving in the summer increases fuel mileage by 8 to 12% over driving in the winter months.

      Temperature also affects the tires’ inflation pressure. Tire inflation tends to fall when the temperature drops. Running tires low on air pressure in hot weather is more of a safety issue than a fuel economy problem. And heat is the tire’s worst enemy. For safety and economy, check inflation pressures frequently with an accurate tire gauge. When seasons change and temperatures fluctuate, increase the frequency of inflation pressure checks.

      Wind

      Headwinds and crosswinds can significantly increase aerodynamic drag and reduce fuel efficiency. For every 10 mph of headwind or crosswind, mpg is reduced by nearly 13%. You can not cheat increasing wind resistance.

      Rain and Snow
      Precipitation such as rain or snow increases rolling resistance because the tires must push their way through the water, slush or snow on the pavement. Also, water is a more effective coolant than air, so the tires, transmission lubricant and axle lubricant operate at cooler (less efficient) temperatures. Rolling resistance and drivetrain friction in light rain increase fuel consumption by 0.2 to 0.3 mpg, per SAE testing.

      Fuel Blends

      While blended fuels provide better startability and protection against fuel gelling than standard #2 diesel, fuel efficiency decreases.“Summer” fuel improves mileage up to 3% more than “winter” fuel.
       

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