MOSFET Rds on curves
You should not use less than 5V to drive the gate.
If you use a commercial gate driver chip such as the MCP1415 you can turn that MOSFET on and off relatively quickly which will reduce the dissipation during switching. 140nC is a fair bit of charge to deal with- some gate drivers can supply 5 or 6A peak current. They also level-shift.
It's also possible to make a simple gate driver with a few BJTs that will also level shift to 7V, and would be perfectly suitable for lower switching frequencies.