Just pay 6mths reg on two of them and get the due dates staged to different times of the year.

My RX8 is the cheapest rego of all cars in QLD at $630.45 - probably 'cause some dope at Dept of transport thinks it's a 1300cc 

Even my dual cab coutier ute is only $693.45

Good time to kick the V8 habit I suspect.......