As Tony, your right foot plays an important part. the maintenance of the car,( Serviced well) does that car have a roof Rack, are your windows open, tyre pressures correct, Traffic, Stop / start, using the correct gears, If possible going up the box ( if it's manual ) as quick as you can Eg/ 1st>3RD etc.
Always fancied one of these, I think they look fantastic. But I have read that the rotary engine doesn't like short journeys. It needs to be run up to normal operating temperature each time. I only have a short trip to work so no good for me.