No, as I understand human history the species existed and thrived long before the advent of SUV's.
However, if gas for your SUV is a requirement for your existence, you may want to beg the Federal Government for a SUV Fuel Subsidy Allowance.
To me, requiring or even asking for people to conserve a resource (particularly a resource that there is no proven shortage) is almost like communal living.
I would never advocate that the government make people conserve unless we were in a state of Total War. However, if you wish to pay ever increasing fuel bills go right ahead. As for me, I work in the industry and try to conserve fuel and my money.
So large families can just buy multiple fuel efficient cars or bikes for every family member? Or is part of conservation not to have children?