Good Sam Club Open Roads Forum: The Verdic is in, New Ford 7.3 V-8 Gas mpg not so Great
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 > The Verdic is in, New Ford 7.3 V-8 Gas mpg not so Great

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GDS-3950BH

DC

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Posted: 01/24/20 06:22am Link  |  Quote  |  Print  |  Notify Moderator

dodge guy wrote:

FloridaRosebud wrote:

GDS-3950BH wrote:

Why would anyone expect an engine, although newer, with 2 less cylinders but a larger displacement, to get noticeably better fuel efficiency? Especially so in something with the aerodynamics of a brick like a heavy motorhome. No such thing as a free lunch.


Yeah, that was kind of my thought as well. I had a chevy 454 in a 3500 Savanna Van back a few years ago, and my gas mileage never was above 10mpg. It went down to 7-8 when I was towing my 12,000 pound trailer. There is no free lunch. As someone in an earlier post said, good gas mileage and RV should never be used in the same sentence.

Al


It's called technology. Replacing a 20 year old motor with something new should get better mileage. Just like when the V-10 replaced the 460, more power and better mileage. Otherwise all it is, is a new motor with nothing to be said for it.
Hopefully we get some real world reports and not some information from a couple guys I wouldn't trust driving a pedal car.


LOL...........Whatever you say. There is one in every crowd and I'm not referring to a pedal car.

noteven

Turtle Island

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Posted: 01/24/20 08:47am Link  |  Quote  |  Print  |  Notify Moderator

For the best fuel economy per ton/mile you need a high compression long stroke turbo supercharged engine that has in cylinder multi-injection of a high power density fuel... like big trucks use...

Adding more overdrive trans ratios in front of salt flats axle ratios doesn’t do much for tow performance but works great for no load driving.

BigRabbitMan

Cottage Grove, OR

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Posted: 01/24/20 08:57pm Link  |  Quote  |  Print  |  Notify Moderator

noteven wrote:

For the best fuel economy per ton/mile you need a high compression long stroke turbo supercharged engine that has in cylinder multi-injection of a high power density fuel... like big trucks use...

Adding more overdrive trans ratios in front of salt flats axle ratios doesn’t do much for tow performance but works great for no load driving.


My coach is about 15,000 lbs. With the original carbed 440 it got 7+- mpg. Changed the 440 to an Edelbrock Multi-point fuel injection system and mpg went up to 7.5 mpg. Those were the numbers for about 60,000 miles.

Changed my engine to one as described in the first paragraph above (a 2006 Duramax 6.6L turbo diesel) and my mileage has been a cumulative 13.4 mpg over 53,400 miles. Same coach, same weight, similar speeds, same driver. It’s the difference that comes from doing what is described above.


BigRabbitMan
Gas to Diesel Conversion project
76 FMC #1046, Gas Pusher became a Diesel Pusher
Discussion thread on this site
"You're never too old to learn something stupid."


wildmanbaker

Kennewick, Washington

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Posted: 01/27/20 09:55am Link  |  Quote  |  Print  |  Notify Moderator

OK, you have a more or less, a fixed load that you want to transport a given distance in a given amount of time. You have two options, a 6.9L engine and a 7.3 L engine. Both can do the job, but you may have to work the smaller engine harder to meet the time requirements. It would stand to reason, the larger engine would require more fuel to just maintain idle due to the larger parts that are rotating. It stands to reason that the larger engine should be able to do the same amount of work without having to work as hard. So, the slightly increased fuel consumption should not be a concern, because if it is working easier, you will be more relaxed when driving. This should be the big plus of the larger engine. I believe that Rabbit Man has said it all....


Wildmanbaker


jy

south east mich.

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Posted: 01/27/20 02:11pm Link  |  Quote  |  Print  |  Notify Moderator

Personally I,d be more concerned about the reliability of the new engine.The v-10 has proven to be pretty reliable.Lets hope the new engine proves to be as reliable.Only time will tell.


2016 wildwood bunkhouse,2018 f150 5.0.Camping with the grandkids now.

diginomad

Dispersed Camping in the Wild West

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Posted: 01/28/20 03:38pm Link  |  Quote  |  Print  |  Notify Moderator

Those TFL whatever guys are clowns. It is disappointing they spread so much misleading information. I'm beginning to think they are amateurs or just DGAF about anything except ad revenue (or both).

Case in point, their dyno results. Someone posted them in a different (inferior) forum comparing Godzilla to the new Diesel. Then started a discussion based on the results as fact. I didn't watch the video, not a fan.

It turns out they gamed the test. Someone observed the runs were executed in different gears. They weren't in 7th doing the dyno run which is required for a 1:1 ratio. Like one was in 3rd and the other in 6ths or some **** like that. Nonsense. I'm not giving them my click.

* This post was edited 01/28/20 03:44pm by diginomad *

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