New diesel owner from ohio

Hello, just thought i would introduce my self.My silver ice cruze is just a week old.i picked it up for just under 21k sticker was just under 28k.i thought that was a great deal for a 2015. my uncle owns a 2014 cruze diesel and a Volkswagen tdi. so Im not new to the diesel game. love the car so far. drove it home from southern Ohio last sat. and when i got off the interstate the computer was showing 48.9 mpg wow i love this car. drove it work all week and now its showing 43. the only thing Im not happy about is no spare tire. Im 50 and been driving for 36 years and never had a flat. Untill yesterday. I just left work, drove about a mile and my low tire light came on, it said 26 psi.i made it about another mile and it was flat, I called roadside assistance as i had to have it towed.I picked up about a 1 inch wide piece of steel in the tread and was close to the sidewall. it was sat and no dealers were open so i had it towed to Monroe muffler and im waiting on a new tire to come in on Monday. anyway i love the car but need a spare ha ha.Funny thing is my dad has 2 cruze gassers and i thought i could use one of his spares to get me by. but thanks to this forum i found out it wouldn't fit. why would gm put a different bolt pattern on the diesel? im looking forward to finding lots of helpful info on here.