Hey you all, great to know their is a contineous on going Rd lovers out their

Hey you all, great to know their is a contineous on going Rd lovers out their. I had purchased my 1981 Rd 350 6 months ago and i drive her hard; when purchased she only had 29,000 kms on her now she is at 33,
still starts first kick everytime my mechanic thinks I should rebore her because of minor ticking. What do you think? One other question, how many miles should I get on a full tank of gas in the city doing wheelies all the time and reving the crap out of her?