Looks like not many people here had experince. Let me share my exeprince.
I used Axis Reserve for Fuel spends multiple times in early March. Whenever the traction was between Rs. 400 to Rs.4000. I got 1% cashback even though there was no surcharge. When the spend was more than Rs. 4000 or less than Rs. 400, I got normal rewards i.e. 15 ER/Rs 200. And did not get any accelreated points that Axis gives for Forex transactions.