Load given, load taken away

Own my truck outright. "Leased" into a carrier; their numbers, plates, customers.
I agreed to a load but now dispatched they want it delivered 2.5 days sooner. Would have to beat feet (poor mpg) and be upside down on my hours (drive nights).
Let them know I only agree to the load as originally described. Now they want me to pick up and relay off.
In a previous business with contracts for custom work I would notify the client for my intent to claim lost profits.
So this is trucking not a job shop. Any opinions? Thanks

 

Sorry. Not a ballin' trucker. Just drive my truck. Why give up any money?

 

Right. Not much concern with staying with this gig. Transferred from company driver side for convenience while I get familiar with things. Wasn't expecting to go past the end of the year.
Their opinion is I committed to the load so I'm the one at fault .

 

My thinking on that route Portland to Green Bay is 600mi/day with a heavy box to get 6.8 (past experience)
At night this time of year not as much.
The point is not to drive harder to make up for getting jerked around.
Was just curious if anyone claims breach without having their own numbers.