[sheepdog 44]

The VW XL1 has low rolling resistance Michelin tires (115/80 R15 front, 145/55 R16 rear). If i could get a hold of some, Should i do:
A, 115mm front, 145mm back,
B, 145mm front, 115mm back,
C, 145mm all around,
D, 115mm all around,
E, I am crazy,

Please consider that my car is front wheel drive, but the XL1 is rear wheel drive, so it has thicker tires at the rear. If i were to swap thicker tires at the front drive wheels, and narrow at the rear, wouldn't that be unstable in the snow? They say to put newer tires with the most tread at the rear so you don't lose the back in the snow.

I would suppose 145mm tires all around would suffice, but a part of me wants 115mm tires all around for maximum efficiency! Would that be a wise choice?

My car is about 1,930 lbs, the XL1 is 1753 lbs, for a 177 lb difference. The XL1 has lightweight magnesium wheels—the fronts weighing 6.97 lb, the rear 8.18 lb. I would use steel spare tires from a Mini cooper and other unidentified cars. The change in overall diameter from my stock tires should be the same.