I only have 190 miles on mine, but haven't seen it do that yet.
So far am averaging 20.5 mpg, but that includes 100 miles on the freeway where it showed 27.... The other 90 miles has been romping on it pretty good... Ye haw
The gains were less for the 11-14 because they came with 2.5" exhaust stock. The 15 has a 2" I have read. Going from a 2" to 3" is really going to open things up! From 2.5" to 3", not so much....
Also, having the new car choked down with a smaller exhaust explains why it only gained 15hp/10tq...
It isn't the largest displacement production flat plane crank ever. In 1910 Curtis made the 8.2L (502c.i.) OX5 V8 with a FPC that was in production about 20 or so I believe....
A Z06 Corvette is not comparable to a Mustang.... 2 seat sports car vs 4 seat pony car. Now, where is the 3200lb Camaro? That would be a comp to bring up....
My delivery date just got pushed back a week too...
I ordered on day 1, may20, and still don't have a car yet.
Others who ordered later, are already driving their's...wtf?
The synthetic "oil" does last a very long time. The problem is, the best oil in the world, gets contaminated at the same rate as the cheapest! Also, with premium oils, whether synthetic of mineral based, only about half of what is in the can is actually the "oil" The rest of the fluid is...
I will never buy a MDS system engine. I hate the way they feel when running on four. The fact that ford doesn't have it yet is the reason I am buying it!
I am not here to tell you how to maintain your engine pal, do as you wish. I am only saying what I do. Why should you care? Or am I making you feel inadequate?