Well, both the cars offer great mileage. The Dzire offers a mileage of 23-24 km/l combined, whereas Amaze offers a mileage of 18-25 km/l combined. You can choose to go with the Dzire if you are looking for a car in a pocket-friendly budget and with low maintenance. On the other hand, Amaze would be a great option if you want a bit of quality interiors and a tough body. Moreover, we'd recommend taking a test drive of the car for a better insight into the performance, comfort and compatibility. Follow the link for dealership details - Car Showrooms.
For this, we would suggest you walk into the nearest service center as they have a separate accessories department where you can check out the prices of touch screen infotainment systems. You can click on the following link to see the details of the nearest service centre and selecting your city accordingly - Service centre.
For the availability, we would suggest you walk into the nearest dealership as they will be the better person to assist you because it depends on their stock book. You can click on the following link to see the details of the nearest dealership and selecting your city accordingly - Car Showrooms.
Yes, the Honda Amaze Special Edition is offered with 14 inches tyres and rim and if you are planning to upgrade it to 15 inches with alloys, there won't be an issue.