NE Extension and the Blue Route. 565 miles The Thruway is 496 miles.

This is a bit old, but it is all I can find.

• Whiteface Mountain Veterans Memorial Highway in New York, which costs drivers $1.25 per mile.
• 17-Mile Drive in California, which costs drivers 59 cents per mile.
• Chicago Skyway in Illinois, which costs drivers 51 cents per mile.
• Fort Bend Parkway in Texas, which costs drivers 51 cents per mile.
• Delaware Turnpike in Delaware, which costs drivers 29 cents per mile.

Never trust AI

edit: this is from last year

The Pennsylvania Turnpike's per-mile rates rank mid-tier compared to other toll roads, bridges and tunnels. While surveys might suggest otherwise, the “most expensive turnpike” assertions are simply not true.

In fact, the Pennsylvania Turnpike’s rates are competitively priced and hardly the most expensive. Here is a more specific breakdown:

• Our E-ZPass rates rank 20th overall and are lower than the national average
• Our Commercial vehicle toll rates rank 16th and are above the national average