3.5 v6 10 speed gas mileage

[tomiverson]

I see a 2021 Gemini 23tw with v6 gas engine.
3.5L
400 lb torque.
Any ideas on gas mileage?

[16ACE27]

Where did you see that?

The 2021 Gemini 23tw has an Inline 5 cyclinder Diesel engine, but you are right about 400 Ft-Lbs of torque.

[tomiverson]

Originally Posted by 16ACE27

Where did you see that?

The 2021 Gemini 23tw has an Inline 5 cyclinder Diesel engine, but you are right about 400 Ft-Lbs of torque.

RVT ad for 2021 model. I think it is on thor web also.
3.5 L, v6, gas

[16ACE27]

From Thor Website:



Maybe you are referring to the Compass 23TW?

[tomiverson]

Originally Posted by 16ACE27

From Thor Website:



Maybe you are referring to the Compass 23TW?

Yes
Ford® Transit Chassis 3.5L V6 EcoBoost® Turbo Gas Engine, 306-HP, 400-lb.ft. Torque

[Chance]

Seems to me that Thor is in the middle of updating specifications.

The Inline-5 Diesel engine does not have 306 HP or 400 lb-ft of torque. Those are for gasoline 3.5L Eco-Boost V6. The new diesel is delayed and will be a 2.0L in-line-4 cylinder.

The 11,000-pound GVWR and 10-speed transmission also confirm new 2020 Transit chassis.



The size of motorhome is similar to other brands that previously used the 3.7L V6 gasoline engine with 6-speed auto, and some owners reported “about” 12 MPG, more or less depending on driving speed. I would expect the Eco-Boost to be in same range. The EB should have a lot more power than the naturally aspirated 3.7L V6, but I don’t personally see the EB getting significantly better fuel economy, everything else being equal. The 10-speed should help with drivability and performance more than fuel economy.

[Chance]

P.S. — Features also show AWD.


Gasoline generator is a great upgrade versus LP in my opinion.

Hope they include larger optional fuel tank for acceptable driving range.

[tomiverson]

Originally Posted by Chance

Seems to me that Thor is in the middle of updating specifications.

The Inline-5 Diesel engine does not have 306 HP or 400 lb-ft of torque. Those are for gasoline 3.5L Eco-Boost V6. The new diesel is delayed and will be a 2.0L in-line-4 cylinder.

The 11,000-pound GVWR and 10-speed transmission also confirm new 2020 Transit chassis.



The size of motorhome is similar to other brands that previously used the 3.7L V6 gasoline engine with 6-speed auto, and some owners reported “about” 12 MPG, more or less depending on driving speed. I would expect the Eco-Boost to be in same range. The EB should have a lot more power than the naturally aspirated 3.7L V6, but I don’t personally see the EB getting significantly better fuel economy, everything else being equal. The 10-speed should help with drivability and performance more than fuel economy.

Thanks! That's what I was looking for. These forums are great for idiots. I like the torque and with 10+ I would go for gas, ya with a little guilt, but don't plan to run it into the ground.
4WD is nice also. Probably doesn't have heated seats. :-)

[Chance]

I wouldn’t trust anything on the specs that come up right now. Whoever is in charge of updates should be replaced immediately.

They are combining specs from different motorhomes and also listing data on wrong lines. There’s no excuse for that. Below we can see motorhome width and height that must be from other Class Cs or maybe As. And interior height over 10 ft. What a mess.


Specs also show AWD as standard, but I’d confirm. Gas tank still shows previous size which I wouldn’t want with gas engine. A 31-gallon Ford option is barely enough for me if getting around 12 MPG.

I’d prefer standard gas engine, but think EcoBoost will become the main engine manufacturers order. It’s going to hurt Transit diesel sales IMO.

[Bob Denman]

You've got to admit: that 400 lb/ft of torque is alluring...

My Sprinter only makes 188 hp, and 325 lb/ft of torque...

https://www.thorforums.com/forums/at...1&d=1590941789

[71_340]

I had three F-150 trucks with the 3.5L ecoboost, last one with the 10-speed transmission that is mated to the 2nd generation ecoboost.

Now to answer your question. They pull like no other gas engine, almost like a Cummins diesel (had them as well) but if you use the power (meaning get into the turbos) they burn a lot of gas. Empty I got close to 20 MPG, hauling a 6000 pound trailer that was cut in half and is probably what you can expect in an RV application unless you drive slow enough to impede traffic. It is either ECO or BOOST, can't have both.

Stick with the diesel option and preferably with a Sprinter chassis.

[Chance]

Ford developed EcoBoost technology primarily to save fuel, so they could install a V6 in place of a V8, or an I-4 in place of V6, etc., but buyers adopted it more for its superior power and low-end torque than added fuel economy, which wasn’t realized to extend originally projected.

EcoBoost isn’t significantly more efficient per se at its peak rating, but what it provides is a much broader range of efficient operation. For example, if a pickup needs 40 HP when cruising empty, and 80 HP when towing a medium-size trailer, the engine can be equally efficient doing both (so maybe 20 and 10 MPG respectively). By comparison, the V8 option can be nearly as efficient at 80 HP while towing, but becomes less efficient at 40 HP when cruising empty (perhaps 10 and 18 MPG respectively under similar conditions).

EcoBoost technology doesn’t lend itself as much to save fuel on larger trucks (or motorhomes) because they normally operate mostly at the higher power conditions. In a pickup there’s a lot of difference between driving empty and towing (40 vs 80 HP in example above), but an equivalent motorhome will mostly drive closer to 80 HP with very few miles driven near 40 HP.

Ford unfortunately doesn’t offer the naturally aspirated 5.0L V8 in Transit, so that’s not an option even if it could match fuel economy in smaller motorhomes. And the naturally aspirated 3.5L V6, which can be as fuel efficient, makes power and torque at much higher RPMs than most of us would want to use, so that leaves the EcoBoost as most practical choice.

As mentioned before, there have been a few smaller Transit-based Class C and B+ with naturally aspirated V6 (previous 3.7L now upgraded to 3.5L) that get by with a little less power and much less torque, and reportedly get around 12 MPG, but drivability of these higher revving engines can’t compete with EcoBoost (not that I’d personally want an EcoBoost).

[Bob Denman]

All I can say; is the my Missus has the 2.0 liter EcoBoost in her new Escape, and it's a rocketship that gets a steady 31 mpg.

[Chance]

An Escape isn’t a motorhome or large truck.


There’s a reason Ford developed a new large-displacement naturally aspirated V8 for larger trucks instead of adding EcoBoost technology to a smaller V8 (which they apparently considered but ruled out).

If a 2.0L EcoBoost had to drive around all the time towing a small camping trailer, it would not get much different fuel economy versus one with a +/- 3L naturally aspirated engine. And it wouldn’t last as long, and require more cost in repairs.

There’s nothing wrong with wanting a motorhome that drives like a rocket as long as expectations are realistic (based on engineering and physics, not hype).

[Bob Denman]

No... but it does point to the effectiveness of the engines that Ford is building.

[Chance]

Gasoline Turbocharged Direct Injection (GTDI) isn’t limited to Ford, which they brand as EcoBoost. Many manufacturers use it on cars, SUVs, and light trucks. I’m not aware of vehicles larger than Euro vans like Transit or Mercedes using this technology. Ford now install V6 EcoBoost in larger Transit, but Mercedes only has a 4 cylinder so they limit to smaller Sprinter vans. The Sprinter 4-cylinder turbo gas is as powerful as the diesel, but Mercedes don’t offer it on largest vans.

Beyond Ford, GM and RAM also use larger displacement gasoline V8s on larger trucks. You can draw your own conclusions.

[Bob Denman]

Did you know that they used to make a 900 cc I-3 Turbo
I'll admit that it won't win a lot of drag races; but it's tough to beat 65 mpg with any other gas-powered car.

https://www.thorforums.com/forums/at...1&d=1591892502