If money is not a major factor, go 6.7 350. Since the diesel is so much heavier, it really limits the cargo capacity in the 250. One major unexpected benefit - the diesel is quieter, making for a more pleasurable drive.
0-30 sometimes feels a little slow, but 50-80 is a rocket. Passing even with a trailer is effortless.

 

Hi Bob, welcome to the forums. You are not going to get anything even remotely close to the 3.5EB in a Super Duty, gas or diesel. The 3.5 EB is a race car motor put into a truck. The 6.2 is an ultra-reliable, ultra high duty cycle work horse motor. The 6.7 is a torque monster for towing 15k+ through the mountains at 70 mph.

This isn't to denigrate the 3.5 EB at all - from almost all reports, it's a pretty good and reliable engine. But it is an entirely different animal than the engines you find in a truck that is mean to be abused all day, every day. The 250 you have on order will have the 6R100 vs the 6R140 trans in the 350 you drive, which has slightly lower ratios in the gearing which will make the truck feel more peppy. Also, if you get the 4.30 axle ratio vs. the 3.73 which is probably what you drove, that makes a pretty good difference.

Also of note, is that even though the diesel feels more powerful, it's mostly just a perception based on the fact that it doesn't really rev, so it sounds like it's working less. The 0-60 times of the 6.2 vs. the 6.7 are roughly within 0.5 to 1 a second of each other. Unloaded of course; start dragging a 10k lb trailer, it's a different story.

So, in summary: you will never feel the speed of the 1/2 ton rocket ship in a super duty in stock form. If you want to go 0-60 in <6 seconds, you are looking in the wrong place. If you want to tow and haul double or triple what the 1/2 will do, for the next 400k miles, now we're talking. Other than sharing a cabin layout, the two trucks aren't even remotely comparable to each other in speed, ride quality, capability, fuel efficiency, or driving characteristics.

 

I just traded my 15 F250 6.2 for an 18 F350 6.7 last Friday. I loved my 6.2 minus the lag at takeoff, which can be tuned out with no adverse effects to the truck. It doesn't have the torque, but it will suffer under towing a moderate load on the truck. I towed a 7k trailer and needed up around 7.9 MPG towing around the PNW. It was a great truck and I had a hard time letting it go. The longevity of the 6.2 is second to none and it does great as a daily driver. If you don't plan on towing much, and make short trips, you will have a great experience with the 6.2
The question I asked myself is "Do I need the torque of a Diesel?". For me it is a yes, I'm going to buy a larger trailer, most likely a 5th wheel, I have a car to tow to car shows, I have a one way commute to work of 30 miles. My 6.2 hit on average about 12.4 MPG with 295/70R18's during my regular commute to work. I had 3.73 gears so that likely played a remarkable role in my economy. So far (only 370 miles in) the F350 with the 6.7 and 3.31 gears is averaging 17.4. That is with the horrible commute through "Portlandia" at 3pm. Straight freeway I saw 21. I'm trying to get up to 1k miles as quickly as possible to take the TT out of a shake down and mileage test. It is way below spec for this truck, but it will give me some comparison numbers to post.

 

 

I have both a 6.7 and a 3.5 eco, never driven a 6.2 so I can't say much about it. What I can tell you is the 6.7 doesn't have that spunky get up and go you are after either. It's a beast, but for a different purpose. If you're in doubt about the 6.2, try a 6.7 at your dealer. It may make you happier, but the 3.5 will always be more fun to drive unloaded... unless the 6.7 isn't stock.

I will say though, that somewhere around ~50+ mph there is a bit of an inflection point, where the 6.7 will out 'spunk' the 3.5 at highway speeds. At least that's how it feels.

 

 

 

 

Don't forget in the 250's torque is restricted until you're in 3rd (4th?) gear.

 

As is the 6.7L at some point I'm sure. 935 ft lbs tq available in first gear would simply be too much fun, and tires wouldn't last very long...

 

I think some good points have been made. I will corroborate what has been said before...even the 6.7L diesel will absolutely not keep up with a 3.5L EcoBoost, nor a 2.7L EcoBoost. Both are much quicker off the line. You are moving a much lighter truck with likely smaller tires through a much lighter transmission with an engine that spools very quickly and has much less reciprocating mass weight. I have 2018 Raptor and my dad has a 2016 F-150 2.7L EcoBoost. I also have a 2017 F-250 6.7L Crew with 3.55 gears on stock 18" tires. Either of those EcoBoost trucks, and also a 5.0L truck, will smoke a 6.7L. I've had two 6.2L trucks in the past. They *feel* slower than the diesel, but in real time the 0-60 numbers are similar.

I would also point out as other have, the 2017 and newer 6.2L received two significant updates: +25lb-ft of torque, and max torque being produced at 700RPM lower. These are very nice improvements. Also, a 250 truck with the 6.2L gets the "beefed up F-150" transmission which is much more responsive and uses less horsepower to turn its pumps and torque converter. Lastly, if you opt for 4.30 axle gears, you gain even more responsiveness. Nevertheless, the 6.2L sees 6.7L tail lights once up to speed...but both see F-150 tail lights all the time.

 

Thanks guys. I will try to drive a diesel but will probably stick with the 6.2

 

I will give my experiences. I traded my 16' 6.7 for a 17' 6.2 f250. I loved the diesel. Amazing power. I hobby farm. Pull a camper maybe twice a year. I found myself trying to find something to pull because I knew the engine needed worked. Most of my driving was a commuter vehicle and family hauler.

additionally, If the diesel were to break out of warranty I would struggle to financially repair the vehicle. If the gas breaks I could repair albeit with financial hardship. Depending on your situation and financial outlook, for some the gas is doable but the diesel outside of warranty could be a financial disaster.

 

We bought a new 18 F250 Lariat Ultimate. Completely loaded. Decided to get the diesel because we just wanted it. There won't be any towing for awhile. Our drive is split interstate and rural. So far it's averaging over 16 mpg and the power is just stupid fun. Quiet.
We traded a 13 Raptor and 15 Expedition in on the truck. The Raptor averaged 12-13 and the Expedition 14-15 in the same drive.
Did we "need" a diesel? Nope. But we wanted it. It came with a 10 yr 120k powertrain warranty from the dealer. The 6.2 is a great engine. But this 6.7 is phenomenal to drive.