On a trip to North Wales, (from south) it was 200miles there and 200miles back, i got there on 1/4 of a tank! i was driving like a saint up there, bare in mind it is all A roads and country lanes. so it was extremly good, on the way back i used 3/4 (damn astra VXR egging me on), i got 400miles to a tank in the end, I was averaging 50odd mpg on the way there and about 30 to 35mpg on the way back,
Im on a revo stage 2 running around 210 to 240bhp (couldnt get on the rollers... too low to run)
Around town if i drive like a saint i get about 29mpg, but it goes to as low as 4.9 when my foot is to the floor, lol
Good and bad times!