Here is all that I could find with some solid numbers.

While there are some contractors with multiple routes that make a profit, the majority of the contractors struggle to make ends meet. Every year, FedEx increases per package and per stop settlement payments but reduces the core zone settlement payment in essence making it impossible for drivers to make more money. In addition, FedEx mandates that drivers bear all expenses and buy their truck. The average operating expenses and benefits are approximately $15,000 to $30,000 annually. Drivers take home pay is significantly less than their gross earnings. Even FedEx’s recruiting materials show that the average contractor makes between $40,000-50,000 after expenses are deducted.

$30,000 for expenses
$30,000 to bring up wages to industry standards
Plus retirement
Taxes of 350 million yearly

Again these are not my numbers, so take it for what its worth.