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Old 09-28-2014, 03:35 PM   #1
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2015 Seneca Fuel Capacity

2015 Seneca - All manuals say fuel capacity is 79 gallons. Even with fuel lights on I have never been able to fuel more than 48 gallons total in both tanks. First thought is a gauge problem. Wanted to see if anyone else has had this problem before I leave it at a dealer.
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Old 09-28-2014, 06:13 PM   #2
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You can take where ever but. Both tanks flat empty will hold 62 gallons that is all. The tank fills are not at top of tanks. Also I am told the smaller tank has the gauge and they level vertically so more fuel gallons left in large tank. 50 is probably all you can expect.
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Old 09-28-2014, 06:40 PM   #3
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What if you are both right.

79 USG x 4 / 5 = 63 Imperial Gallons ????
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Old 09-28-2014, 08:47 PM   #4
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GreyHawk - Thanks for the Reply. Capacity for only 325 Miles isn't very good when you need truck stops to fuel both sides. Very thankful I didn't rely on math and figure the gauge was wrong and I had 79 gallons to use at 7 MPG. I would have been setting on the side of the road for sure. At least I wont go to the dealer and waste my time to learn the same thing.
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Old 09-29-2014, 07:07 AM   #5
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Not sure I like this information. Lol Getting ready to pick up new 37TS and that seems like a lot of stoping on the road for fuel. 30 gals from what they say you have is quote a bit........
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Old 10-01-2014, 04:46 PM   #6
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I did an 1100 mile trip on three fuel stops, and never once were my tanks empty. I stopped because I do not like parking without fuel, just in case I have to use the gen set. The largest fuel stop was 50 gallons or so and the smallest was 20. I got 8.7 fuel economy. Speed was 65 or slower depending on the windy roads in western Va. I don't think its as bad as it seems, though there is a bit of wasted space in the tanks.
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Old 10-01-2014, 04:54 PM   #7
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Quote:
Originally Posted by RULazy2 View Post
I did an 1100 mile trip on three fuel stops, and never once were my tanks empty. I stopped because I do not like parking without fuel, just in case I have to use the gen set. The largest fuel stop was 50 gallons or so and the smallest was 20. I got 8.7 fuel economy. Speed was 65 or slower depending on the windy roads in western Va. I don't think its as bad as it seems, though there is a bit of wasted space in the tanks.
you must of had two stops at 53 gallons . 53+53+20=126 gallonsx8.7=1100 miles
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Old 10-01-2014, 05:20 PM   #8
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RULazy2, good info. I can live with 8.7mpg. What type of rig do you have and were you towing? Picking up 2015 Seneca tomorrow, very excited....
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Old 10-02-2014, 05:07 PM   #9
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RULazy2, good info. I can live with 8.7mpg. What type of rig do you have and were you towing? Picking up 2015 Seneca tomorrow, very excited....
I have a 2014 Seneca 37FS. I was towing my little scooter, a Mazda2 on a tow dolly and we were on a 10 day trip so we were loaded for bear. one of my two biggest fuel stops was Danville VA and my 20 galloner was some Pilot on 81N in Winchester VA right before I got into MD I think. We were traveling to Gettysburg. I arrived in Gettysburg and remember telling the wife we did not have to top off because the tanks were reading more than 3/4. On the way back we drove 15S to 470 to 95S, and decided to detour to Williamsburg VA (Cheatham Annex is a really nice camp ground). Stopped in VA for Fuel again (at 3.58 a gallon I was not going to pass it up) before 64E then made it all the way home on that tank. Not a whole lot of idling and I drive reasonable. It was pretty fun and quite surprising. Still and all, I would like to see about putting a bigger tank on...there is some room under the chassis and Freightliner makes a whole load of different tanks for the M2.
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Old 10-04-2014, 06:00 AM   #10
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That sounds like good fuel mileage. On any of the 3 Cummins I owned, I never saw any improvement until after 50-60 thousand miles. Enjoy and congrats on the rig.
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