I would like to hear your reasoning for the same. I can find very few circumstances where offering the EB V6 alongside the 5.0L in the Mustang makes very much sense, and even fewer where doing so bodes well for the average enthusiast.
One of the first stumbling blocks is production line complexity. Adding another engine altogether to the Mustang production line brings more part numbers, greater complexity, greater opportunity for problems, and is likely to lengthen the average time required for production.
Those aren't necessarily a bad thing, if the changes they engender bring greater desirability and ease of sales to the lineup. I don't really see that happening here. Do I think some folks who would otherwise walk right on by a 5.0L powered Mustang GT would consider the same with a GTDi V6 under the hood? Certainly. But the question is would that number be great enough to justify the costs associated with offering that mill in the first place. Given the other things Ford could do with that money...opportunity costs... and the likelihood that the 5.0L will go over like ice cubes in Hell, I doubt it.
Some argue Ford will do this to improve their CAFE numbers. If the Mustang sold more than 200k units on a very good year I might agree. The reality is that, yet again, you will have a difficult time making a serious case for the notion that splitting potential GT sales between the 5.0L V8 and the 3.5L GTDi V6 will improve CAFE numbers enough to justify the costs involved right now. We are running into opportunity costs yet again, and the reality is that if Ford is that determined to imprvoe fuel economy numbers there are still preferable alternatives to the above which haven't been done and aren't soon planned.
Also worth mentioning. Some folks have drawn a comparison between the F-150, which will offer both engines, and the Mustang which likely wont. The problem is that there is no comparison between these two. If the motive is to improve CAFE numbers the difference in production numbers make the comparison pointless. F-150 moves more than half a million units on a terrible year, while Mustang might move 200k units in a really good year.
Offering both engines in the F-150 gives a real measure of production flexibility allowing the F-150 to give or take production in either line should one of the engines prove extremly popular, or not so popular, in another model. Tha volume also means that the F-150 can make a serious impact on CAFE ratings.
Offering both engines in the Mustang only makes sense to me if....
a: Ford is actively pushing the 3.5L GTDi V6 in the hopes of phasing out the 5.0L V8 engine line. Possible? Yes. But it seems unlikely that Ford would try to phase out a brand new engine immediately following introduction of the same
b: the 5.0L V8 is to be a premium engine offering notably above the 3.5L V6. Again, I don't see this happening, This would leave Ford having to explain away the rather stiff pricing on the Taurus SHO and every EB powered Lincoln. Further, the 5.0L is going to be a mainstream, high volume piece produced at Essex on a line with a lot of capacity. It would almost certainly cost Ford money to artificially limit the appeal of this engine through artifically higher costs.
c: the 3.5L EB V6 is a lot more fuel efficient and is truly meant to be a less thirsty, and slightly less powerful, alternative to the 5.0L V8. This one arguably makes the most sense, but seems unlikely as well given my guess that the EB V6 might be worth another two mpg or so compared to the new Coyote V8. Even if we figure three mpg difference in both city and highway driving, so long as gas prices stay below 3.00 a gallon nobody is going to care.
I am just a messenger, but I am glad to spread the message.
Here is hoping simple logic continues to make sense at Ford.