Starting in November BMO will be switching things up a bit with regards to how this no fee BMO Mastercard will accumulate rewards AIR MILES Previously for every $20 spent at Shell and other AIR MILES partners, you would be awarded 2 AIR MILES, and for every $20 spent at all other merchants he would be awarded 1 AIR MILE. Now with BMO‘s updated earn rates, for every $25 you spend at Shell gas stations and other affiliated AIR MILES rewards partners you’ll receive 3 AIR MILES, and for all other purchases not on this list, every $25 you spend will award you 1 AIR MILE.