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.