Benefit of extra fuel tank.

We still stop as often as if we didn't have the ability to go all day without stopping, but we stop at rest stops, town parks, places other than a noisy, stinky, busy, fuel stop. That's the main reason we have the auxiliary tank. I fill the tanks when they get empty, I rarely pay much attention to prices. I got the auxiliary fuel tank to lessen the stress, not add to it by searching for cheaper fuel, and then trying to find it.

curt12914 wrote:
Personally, I would never even think about either replacing a good factory fuel tank with a larger tank or adding an auxiliary tank.

If you want more capacity solely to buy cheaper fuel, it will take one heck of lot of fill-ups to pay back anywhere near the out of pocket cost. If you do it for longer stop intervals, I easily get two bathroom stops out of a tank of fuel with my existing tank.

Adding more fuel at 6-7 pounds per gallon never made any sense to me.

Exactly. Not mention fresh fuel is always better and stops to stretch helps to stay alert. It doesn't pencil out unless you are headed to Alaska and even then. Now, if we get back to 1973 and fuel shortage, then it might make some sense, but even then they rationed us to how many gallons we could buy.

Devo the dog wrote:

Cummins12V98 wrote:
I was bucking a big head wind yesterday towing and managed to get 6.5 mpg. Barely made it to my usual fuel stop. I filled 31 gallons in a 32 gallon tank.

The 2005 Ford V10 got 6.5 once time pulling in a headwind and pulling the same trailer in a headwind, the 2019 Ram HO diesel got 6.5. The only downside is that Ram's mpg is more sensitive to headwinds and sidewinds. The upside to the Ford is that it has a 36 gallon tank. The Ram is a wimpy 32 so the distance between fuel stops is about the same as the Ford V10 because the fuel mileage of the Ram is only a little better than the Ford pulling the same trailer.

You towing 34k combined with a 13’ 4” high and 102” wide RV?

Me Again wrote:

Cummins12V98 wrote:

ferndaleflyer wrote:
2 posts above I disagree with. 1- the big tanks do save a lot of money and 2 I have been in that same Kroger in GA with my DP with the same trailer at 72ft no problem. I never had any store discount and put 100+ gallons in the DP. It’s a choice and if you want to ride you have to buy fuel no matter what it costs.

Ya simply don't want to take chances when there are two trailers behind the tow vehicle considering access and egress.

I would over the evening phan my morning fuel up if require with Google Earth, planning my route into and out of a filling station, when we towed the 39'4" 5th wheel.

Hmmmm, I don’t need fuel in the morning many times as it’s purely random what my fuel level is at the end of the towing day.

I get fuel as needed along the way.

Me Again wrote:

Cummins12V98 wrote:
I was bucking a big head wind yesterday towing and managed to get 6.5 mpg. Barely made it to my usual fuel stop. I filled 31 gallons in a 32 gallon tank.

Headed North for the summer?

Yes, gots to get the Boat ready for Shrimping on the 19th.

Funny story. I purchased my Duramax and it has 60 gallon tank in the bed (maybe really 40 + 24 factory). Anyway, my old hauler was a '99 Chevy 2500. When towing with '99 we'd go 125 miles and have to fill it. The diesel goes much further, even at 10mpg towing, I can perhaps make conservatively 650 - 750 miles.

I had filled the truck to the max months before the virus. But my campout was rained out. Then virus came and I must've gone 18 months on that tank.

The Duramax isn't my daily driver, or even my 3rd vehicle to drive. But when raining, I'd take it out.

Cummins12V98 wrote:
I was bucking a big head wind yesterday towing and managed to get 6.5 mpg. Barely made it to my usual fuel stop. I filled 31 gallons in a 32 gallon tank.

The 2005 Ford V10 got 6.5 once time pulling in a headwind and pulling the same trailer in a headwind, the 2019 Ram HO diesel got 6.5. The only downside is that Ram's mpg is more sensitive to headwinds and sidewinds. The upside to the Ford is that it has a 36 gallon tank. The Ram is a wimpy 32 so the distance between fuel stops is about the same as the Ford V10 because the fuel mileage of the Ram is only a little better than the Ford pulling the same trailer.

Cummins12V98 wrote:

ferndaleflyer wrote:
2 posts above I disagree with. 1- the big tanks do save a lot of money and 2 I have been in that same Kroger in GA with my DP with the same trailer at 72ft no problem. I never had any store discount and put 100+ gallons in the DP. It’s a choice and if you want to ride you have to buy fuel no matter what it costs.

Ya simply don't want to take chances when there are two trailers behind the tow vehicle considering access and egress.

I would over the evening phan my morning fuel up if require with Google Earth, planning my route into and out of a filling station, when we towed the 39'4" 5th wheel.

Cummins12V98 wrote:
I was bucking a big head wind yesterday towing and managed to get 6.5 mpg. Barely made it to my usual fuel stop. I filled 31 gallons in a 32 gallon tank.

Headed North for the summer?

For me it’s not about the money, it’s just about having one less thing to worry about while traveling. I start to get real nervous when I get down to 1/4 tank, if I can avoid that feeling I’m a much happier traveler.