In my car before i joined the scheme we did over 100k in it. On the scheme stuff has cahnged and most I have done is 43k.
On the scheme you get a 20k allowance per year so if your kona takes longer to arrive then I would guess you would get millage pro-rata 1,666 miles a month.
Personally right now I am only doing 5k to 6k max a year so 15k/18k over 3 years and is another reason of many as to why i recently left the scheme.
In your case it make sense due to the high mileage. but for me in 5 years I may of only done 25k in 10 years 50k and the car should still be good for a few more as newer cars seem tighter for longer.