To put this in some perspective, the OP says he paid (rounding the amounts) $30 in tolls to go 201 miles. That means he paid $1 every time he drove 6.7 miles (201/30). If he's getting 6.7 miles to the gallon, then every time he burned a gallon of fuel he paid an extra $1. Let fuel go up by a dollar a gallon, and see how good an idea this seems to be.
Interestingly, increased gas mileage is penalized by this tolling approach. Suppose he's getting 10 mpg. Since he paid an extra $1 for every 6.7 miles, he paid $1.49 for every ten miles driven (10/6.7) or for every gallon of fuel burned. How does an increase of $1.49 per gallon sound to you?