How big is your fuel tank?

^this!

Oh and to add to the 6.7l Cummins fire, mine is on 35" tires, factory 3.73 gears which gives an overall gear ratio of about 3.42:1, fully emissions deleted with EFI Live custom tuning and I avg 16-17 mixed driving.
I RARELY take an empty road trip with the truck so I cannot give you those kind of numbers but towing the boat is consistently at 15 mpgs on highway and with a 14k 5th wheel, I avg between 9 and 10, cruise set at 70.
Never a hiccup, burp or fart from that engine. It just pulls and pulls and asks for more. So good mileage can be had from bigger trucks. And I would NEVER have a DPF Cummins intact. That was one of the single worst EPA mandates ever. If I HAD to buy a newer truck, I would get a newer DEF Cummins. They do get better mileage stock than a DPF truck but not as good as mine.

If you are asking me, it's 34 gallons. And I do have an undercover bed cover.

2wd? I've never seen 20mpg driving 75 plus in any truck.

I have... but it was a 2 wd Chevy S-10 with a 4 banger and a 5 speed

Thats funny because my son had a 2 WD Ranger with a 4 Banger and a 5 speed that wouldn't do over 70 and never saw 20 mpg.

I see what your doing there

My claim is typical an believeable unlike your 22 mpg DPF 6.7. Im sorry it bothers you so I don't believe you. It couldn't bother me less that you don't think a 4 cylinder manual transmission 2wd s-10 cant go 75 and cant get over 20 mpg. Ive been over 90 in a 4 cylinder 2wd 4speed ford ranger... guess what it got over 20 mpg also

Ya know what, I could care less whether you believe me or not. I could show you the gas receipts for the most recent trip to SD, but I'm sure you wouldn't believe that either. It matters not to me.

At a minimum it would be nice if you correctly used the saying... "couldn't care less" which implies you don't care. Saying

implies you do care.

Mine will get 20 plus at 75. Its just a 6 cylinder though.

It implies nothing. Couldn't is the abbreviation for could not. So, in your geniousness, how could COULD NOT CARE LESS imply anything other than there is no amount of caring which would be less than what I care, for your opinion?

Are you sure you are not Tallgrass' alter ego from the bunker?

Let me re-phrase it then. I don't give a sh*t what you think.

Is that clear enough for you?

And yours is not a stock 6.7 DPF. Its not a stock 5.9 either.

If you don't understand the saying that's not my fault, but it reflects poorly on yourself to use it incorrectly

I have no alter ego, and its perfectly alright with me if you don't give carp what I think I still don't believe that your stock 2008 6.7 cummins gets anywhere near 22 mpg, but its been fun

Interesting article about the titan diesel. Couldn't help but notice this excerpt:

"In comparison a four-wheel-drive 2014 Ram 3500HD Laramie Longhorn Crew Cab with the 6.7-liter Cummins turbodiesel I-6 (385 hp, 850 lb-ft) achieved 14.1/17.6/15.5 mpg."

http://wot.motortrend.com/2016_nissan_titan_xd_cummins_gets_17_7_mpg_comb_in_real_mpg_testing.html