Texas State Troopers do not write tickets for less than 100mph on rural interstates. They issue warnings as a matter of department policy - unless you are rude or combative, in which case the officer does have the option of giving you a ticket.
If you want to include fuel stops, simply include the time it takes to board the plane and for everyone to get situated (30-40 minutes) and it evens out. Food can be eaten both while on the road and in flight. In the case of the car trip, you may even bring food from home and reduce your cost.
Texas appears to have less than intelligent law makers if 100mph is the point in which tickets are issued by policy. They are missing out on a huge sum of income then. California has different policies regarding speeding tickets, apparently.
I don’t eat in my car while on trips. This takes away from the 1) enjoyment of the meal and 2) safety of keeping my mind fully on driving. But, go ahead and take unnecessary risks.