Mileage-Charts.comThe mileage chart for India can be downloaded here (24.9MB, updated 15th Jan 2019).
The full list of cities contained within this table can be found here: list of India cities.
India also contains the following tables:
Mileage charts are provided as Excel workbooks, and give driving distances in miles and kilometers, and travel times. As a bonus, every pair of cities within our charts have distances and travel times for both directions!