Cpa/tax help

OK, so i have an inhome business as an independent distributor with a network marketing company that i use my vehicle to drive to opportunity meetings, corporate events, 1 on 1 meetings with prospects, but i dont have a mileage log that ive kept, the only thing ive kept is all my gas receipts, what should i do? i go see a cpa this year for the frist time, i usually do my taxes on tax slayer, but since ive been involved with this business, im looking to get majority of my mileage/fuel tax deducted.

any advice would help

thank you

Zane
USCG