For your brake light issue, the fluid might be low. If not, have a shop diagnose the condition of the brakes.
And I only asked what type of gas is because it varies for the trim of the vehicle as well. If you have a SC (supercharger), of course you want premium gas. It is a forced induced vehicle that requires better combustion and a higher octane fuel will suit that with less residue on the spark plugs. But since you are an LT, it seems like it doesn't require to have premium. But it would be better to test to see if makes a difference. At only a couple cents more a gallon, it is a pretty cheap way to test. And since you have diagnosed the spark plugs, what brand are they? AC Delco is the original installed plug, ok for the vehicle but I have found out that E3 spark plugs burn the fuel more efficiently and result in better economy and less residue and longer life.
Any questions about the Balt, all answered here:
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