Fuel Consumption about right?

[Nathan1305]

So since I filled the 306 I've got 485 miles out of it before the light flicks on during driving. It's on a stage 1 tune on a Lucas pump. I do 8 miles 5 days a week for work and every week or two I will do a 80 mile round trip on the motorway. Is this a good amount of miles to a tank or should it be better