Costs me about ?30-?35 to fill up my mk3 when very low....reckon ?42 would get me about 330 miles (think thats what I spend a week going to and from work and thats 70 miles ish a day). Thats on a mixture of back roads, dual carriageway doing about 70 (as I pay for fuel!!) and then far too long stuck in town centre queues. MFA can read anywhere from 29mpg to 36mpg on a 35 mile run.