ITC doubt in petrol bunk

No you cannot take ITC on licence fees since the licence fees is for sale of petrol or diesel which are non-gst supply. 

You can use ITC on purchase of lubricants fully to pay GST on sale of lubricants.

LFR on Petrol Diesel is business expenses like insurance etc. The LFR invoices being raised by the Oil Marketing Companies are being uploaded in GSTR2A. If the ITC on LFR could not be availed by the dealer there was no need to upload the invoices.

But what if I purchase uniform for our employee in petrol pump. can I take GST input on this ?

https://www.cbic.gov.in/resources//htdocs-cbec/gst/GST-Update22122018.pdf;jsessionid=9AD8CCEB2DDC5E8DA0300AE831E08573

this says this is a mixed supply