Alto generally returns mileage of 15-17 in city & 19-21 on highway (depending upon driving conditions & style). With 100% AC, you can expect 15 in city & 19 on highway (speed not exceeding 80-85).
Anti-rust/under chassis is good (in long run). For Alto it may cost in the range of 1-1.5K.
Teflon coating is basically for shiny/wet looks. It gradually wears-off in 2-3 years. The money could be better utilised. Engine waxing is NOT at all required. Instead of spending on these 2 items, I would suggest you spend that much more on Music System - buy a better one (8-10K).
I'm not very conversant with Music System etc. Others will be able to guide you better.
Honesty is not a Spare Wheel that you pull out when in trouble. It's a Steering Wheel that keeps you on the right path throughout the life's journey.
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