The Toyota Corolla Altis comes with four variants like J, G, GL and VL.
The J is the base petrol variant which comes fitted with ABS with EBD, tilt-telescopic power steering, power window and other standard features and G is advanced from it which comes fitted with some more features like SRS airbags, keyless entry, advanced audio system, power windows and Multi-information display etc.
For a detailed information about the car please click on the given link or highlighted body text.
Karthik, we are afraid that we won't be able to help here as there are many mechanics available in Bangalore and everyone have it's own specialty. This is something that you need to search and investigate in Market. Go ahead and check with your friends as well. :)
The ARAI claimed mileage for Toyota Corolla Altis Diesel is 21.43kmpl and 14.53 for Corolla Altis Petrol. However, these figures have been achieved in the controlled condition, therefore in practical conditions the mileage drops by 3-4kmpl depending upon driving conditions.