I dunno.
Bronco Sport? My bad! Thought this was Bronco 6th Gen site?
3/8th difference in diameter will not make any more difference than normal tire pressure deviation, but your engineering degree is obviously better than mine.
So the compooter is always optimistic; last tank it said 20.7, and the maths werked out to 20.48.
I reset it (20.7 MPG) when I reinstalled the moofler, drove to town today, ran some errandos, and came home with this.
Preliminary results are extremely gratifying;
There's waaaaayyyy too much fab went into to this thing just to create more back pressure...which is what it does.
And more back pressure is always B-A-D.
Meh.
Unless someone has a limited slip clutch type differential, or is driving around on dry pavement with their diff(s) locked, it really won't make much difference.
The point I was trying to make is that the dealer is trying to BONE the original poster into buying FOUR new tires, which ain't...
Hey Liverado!!! (this bourbon caused me to fuskitate your callsign) YOU are the cause of this!!!
If you hadn't chopped open that muffler, knobody woulda knowed!!!
I saw what the inside of these stock mufflers look like elsewhere on B6G;
https://www.bronco6g.com/forum/threads/modded-stock-2-3-muffler-for-more-sound-video-sound-clips-added.67056/
WhoTF would put a moving part inside a muffler?!?!?!?!?!?!?
I am convinced that these car manufacturers are...
Jest a leetle observation here; if the difference in circumference between a 100% and 50% tire will crater the drivetrain.........THEN YA'LL BETTER NOT AIR DOWN YOUR TIRES TO GO OFF-ROADING!!!
It's simple physics on our side and jest plain old greed and marketing on the dealer's side.
No reason...
I did an oil filter relocation when I upgraded the 351W in my 1985 F-250 to 466 Big Block Wholesomeness, along with a B&M oil cooler.
One of the smarter thangs I've ever did...
I had a set of KOs, the early ones, on my 85 F-250.
The front end of that truck weighs 3Klbs.
I got 40K miles out of those tires, which is unheard-of on that truck.
I'm sure there's newer tech out there, but I L-U-V BFGs!!!