The Canada Revenue Agency- is the government which have the last say- in other words- If they are asking you to provide gas receipts and you never kept any- Then you need to advise them. When claiming any type of business expenses you MUST keep all receipts incase CRA ever asks for them- This is proof that you used this amount and they can then verify. You will need to contact them directly so that they can advise you further.
https://turbotax.community.intuit.ca/replies/2647704
