BEWARE the siren song of INSTANT GRATIFICATION, leex6221!
(Not that anyone who has heard this advice ever FOLLOWED it!)
Going into debt, without any substantial salary or career progression likely to sustain pay-off, even for a 'way cool shiny new KLR650 suggests an unfavorable, unpleasant outcome, IMHO.
As to leaving a KLR outside, even with a cover, the plastic FADES notoriously with exposure ('specially RED, seems to me). I have BLACK Generation 1, and . . . even the BLACK is fading!
Fuel mileage? Around 50 mpg, but . . . your fuel costs won't APPROACH your DEPRECIATION, on a new bike.
Hey, you've got a serviceable bike; can you not be content somewhat with your PORTION?
If you want other capabilities, you can probably find a more manageable, financially, USED KLR650.
After you GRADUATE; land a plum, lucrative JOB, get your STUDENT LOANS in order; THEN consider a new bike.
Again, I don't expect you to heed this advice. Maybe you will this additional suggestion: Don't worry about 55 mph during break-in; I minimize break-in rituals--just treat her gently during the honeymoon, and you shall have a long service life; again, IMHO.