Higher octane does not equal lower MPG. The only reason it might seem like that is because most people who run high octane fuel have increased there timing and probably have a lot more done to the car so they get poorer gas milage.
When my car was bone stock with just the K&N and 2.73 gears I got 20-24 MPG (depending on how I drove) and up to 28 MPG on the highway. Now I get between 18 and 20 MPG.
Yes Mustangs can be hazzardous in rain or snow. I drove my GT in Northern Canada for a couple years. It takes a lot of patience and skill to avoid an accident. However these are not front wheel drive grocery getters were talking about here. Any rear wheel drive car with decent power and torque is going to have traction problems in poor road conditions. It shouldn't be that much of a concern. You should have no problems in rain unless your racing, and if your dumb enough to race in the rain, you really shouldn't have a V8 Mustang.
Hope that helps.
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