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Old 04-14-2016, 05:54 PM   #1
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Seneca fuel range

Question re fuel range. Max I have traveled between fill is 456 miles; burned 48.6 gal for 9.3 mpg. Burned 25 gal from one tank and 23 gal from other. Any clue on usable fuel per tank or ranges others have gotten between fills. Guage not reliable.

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Old 04-14-2016, 08:38 PM   #2
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With the fill mounted somewhat on the side it is impossible to get all 70+ gallons. It has been suggest to add a short extra filler neck to get all the capacity. Also, keep in mind the pick for the fuel is not on the bottom but rather an inch or two off the bottom. I am thinking of carrying couple of 5 gal tanks and test the mileage!! lol
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Old 04-14-2016, 08:40 PM   #3
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I have gone 400 miles between refueling stops many times and would not hesitate to go 500 miles. However the trips I have taken often had limited stations for refueling after I had covered 400 miles. I tow a Jeep and average 8.3 mpg. Who really knows what the usable fuel in the Seneca is? It's got two tanks that hold 74 gallons, so, I would take a wild guess you might be able to use 70 gallons of that 74 gallon capacity. 70gal x 8.3 mpg=581 miles. But when you get there are you guaranteed there is not a power outage that would mean the station could not pump fuel? (I have experienced this once in my travels). Thus I refuel every 400 miles + or -.
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Old 04-14-2016, 08:46 PM   #4
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My guess is if you add a short filler neck to the tank the extra fuel you put in the neck will flood the tank and it will flow out of the breather tube that lets air into the tank as you burn the fuel down and spill onto the ground.
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Old 04-14-2016, 08:51 PM   #5
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I'm one of the "lucky" ones, my gauge is fairly close.

I try not to go too much below 1/2 tank, around 400 miles or so, before I am looking for fuel. Maybe it was my time in the Navy, and certainly my time as a firefighter; both imprinted the habit to watch the fuel carefully!

But another big reason I fuel earlier is the generator low-fuel cutoff. Somewhere around 1/4 tank the generator will run out so as to not drain your entire supply. I always want to retain the ability to run the generator, so I always keep a "cushion".
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Old 04-14-2016, 10:48 PM   #6
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I'm like Rob...I drive on the 1/2's, that is, when I hit 1/2 tank I start looking. This is especially important when you are off the interstates and in unknown territory.
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Old 04-15-2016, 11:42 AM   #7
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Fill the passenger side first, that seems to make the gauge more accurate at least for me. That said I fill up between 450-500 miles and have never put in more than 51 gallons. I averaged 9.5 mpg towing our Jeep. Cruise set at 62 mph.
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Old 04-16-2016, 01:25 PM   #8
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I agree with the others - I try to plan fuel stops every 400 miles or so. I've gone as much as 500 miles in a pinch, but I'm not comfortable going much beyond that. It would be nice to get an actual capacity at some point.
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Old 07-16-2016, 08:37 AM   #9
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We had to contact freightliner headquarters. They finally tested the dash, they ended up replacing it and now it seems to be ok. Have only been on a couple short trips.
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Old 07-16-2016, 09:45 AM   #10
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When you say they tested the dash do you mean they tested the fuel gage in the dash?
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