Wrong to be mad?

So when we go to the beach with my husbands family I will be 34 weeks pregnant and I have a one year old. Last year and years in the past we have driven with his brother and father in a 3 row SUV. My request this year is to drive our own car so I can have everything I want and won't feel uncomfortable requesting stops etc. He said no because we wants to save on gas money and milage on the car. Is it just me or is this extremely inconsiderate!? We are not currently hurting for money and our car is a 2019 so it would have no trouble making it the 7 hour drive...