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Old 10-04-2014, 05:57 PM   #11
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Short Kid, my last DP got better mileage than that, but I am more than happy with the mileage. I like the convenience of being able to fill both tanks at the same time as well and having my DEF fill on the pump side. My FIL has a 36TS and is reporting the same mileage over his epic Florida to NC to Indiana to SD to UT to AZ trip which he is absolutely ecstatic about after his 5 mph Foretravel. He also commented on the break in time. What we have been able to find about these newer Cummins is that the break in is not as dramatic as it once was. We were told to expect a slight increase after a few thousand but not like they used to be. Time will tell, I only have 2400 on mine, so I have a bit to go.
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Old 10-06-2014, 06:48 AM   #12
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RU Lazy2, I thought the same thing about all that wasted space behind the rear axle. Wonder if a 40 0r 50 gallon tank can be installed and piped up to the front tanks?? Any ideas from anyone?
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Old 10-06-2014, 04:06 PM   #13
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Quote:
Originally Posted by greyhawk885 View Post
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.
So you are saying the Seneca fuel gauge is accurate? With the low fuel light on I could only get 48 gallons in my Seneca. I figured I had almost 30 gallons left. I fill the tanks until the fuel is at the top of the fill opening. With the fuel at this level I dont see room for over 17 more gallons. Guess I need to pump the tanks dry then fill them to find the true capacity.
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Old 10-06-2014, 04:18 PM   #14
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Of course you don't want to fill the tanks completely, you have to leave room for expansion. So Jayco advertises a 75 or 79 gallon fuel capacity on the Seneca. Now is that tank size or actual fuel capacity? IF you could fill the tanks completely do they hold over 90 gallons but a normal fill to the top of the fill hole leaving room for expansion the capacity is 79 gallons? Or is it 79 gallons and a normal fill to the top of the fill hole 62 gallons? Hmmmmmm.
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Old 10-06-2014, 06:09 PM   #15
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If you look by the tanks cap, it will be stamped. My drivers side on my 2014 TS is 34 and the pass. side is stamped 40 gal.
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Old 10-06-2014, 06:58 PM   #16
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As to the fuel gauge reading, my FL dealer and some others I have spoken to have stated the fuel quantity indicator needs to be calibrated. Basically, there is one part for all different configurations of the fuel tanks on the M2. They might have missed yours and a slight adjustment needs to be made.
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Old 12-29-2014, 09:11 PM   #17
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We did our first road trip in the new Seneca from OH to NC just before Christmas. On the trip back, I left the interstate (and its plethora of truck stops) in northern WV and headed up a state route with just under 1/4 tank showing on the gauge and about 40 miles to the next Flying J. About 10 miles in, I could watch the gauge dropping. At 20 miles in, the needle was bouncing off E. After enduring another 5 miles of certainty I was going to run out of gas (with the wife glaring at me ), I found a BP station just over the Ohio border that I could squeeze into and put about 20 gal in the driver side tank. I was at 528 miles since the last fill up at that point.

I filled up the rest of the way at a truck stop close to home. In all, I put 61 gallons in with 603.1 on the odometer giving me a respectable 9.9 mpg towing the Honda CRV at 62-64 mph.

My inadvertent exploration of the edge of the envelope on fuel range taught me that 500 miles is probably about as far as I should go between fill ups. It would appear that the real capacity is a bit south of the advertised 79 gallons.
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Old 02-25-2015, 10:00 AM   #18
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Have a 2014 Seneca. Fuel gauge is not correct. When the low fuel light comes on, we stop for fuel but still have 1/3 or more fuel in both tanks. Have had it to freightliner and they said there was nothing wrong. I think that the sender is too short for a correct reading. Going to have they check it again when we take it in for they auto brake recall.
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Old 02-25-2015, 06:17 PM   #19
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Seneca Fuel Tanks

I traveled 58 miles after the light came on and only put 41 gallons in the tanks today. Full tanks, two of us worked hard to get every possible gallon in on both sides. The gauges are way off or the tanks don't hold what they say they do.
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Old 03-12-2015, 04:24 PM   #20
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I have just done 4000 miles plus and got 9.5 to 10mpg. with 62 gallons you can go 575 miles and I have. Still most put in was 54 gal. Tow nothing. We rent a car if we need one.
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