when do I need a fuel flush and brake flush

What is your question?

Dealer tells me my Mazda3 (2014) 33,000 needs a fuel flush - I'm still getting between 32 and 38 mpg highway and 20+ town driving. I'm also not experiencing any dash lights or soft brakes - drives like I just drove it out of the showroom. A reputable tire company said to wait on this until I need my brakes replaced.