I receive this reply from there team :--
"We write with reference to your query regarding credit card XXXX
We will charge a fuel surcharge of 1% or a minimum of Rs. 10.00 (whichever is higher) on the transaction amount in the following scenarios:
1. When you purchase fuel at any outlet other than HPCL.
2. When you purchase fuel in an amount less than Rs. 400 or more than Rs. 4,000.00 per transaction, with no waiver on the excess amount over Rs. 4,000.00 or below Rs. 400, even at HPCL outlets.
3. When the card is swiped on a non-ICICI Bank EDC machine, even at HPCL outlets.
A complete waiver of 1% on fuel surcharge every time you re-fuel.
Only Onus transactions are eligible for surcharge waiver along with GST 18%.
In addition to the fuel surcharge, an 18.00% Goods and Services Tax (GST) will be applicable on the surcharge, effective from July 01, 2017.
Alternatively, you may also check these details from
www.icicibank.com _ Service Charges and Fees _ Personal Banking _ Credit Cards _ Most
Important Terms & Conditions (MITC).
For more details, please write to us at
customer.care@icicibank.com or you may also call us on 1800 1080."
But i did not found any mention of Rs.400/-- as minimum purchase value anywhere. I seen card MITC and other terms written on icici site.