Sorry to sound like somebody's dad, but, if you really want the job that could lead to pro. photographic qualifications and a new career you'll have to make a hard choice. I don't know what kind of photography he does but may well need several tripods that fold down but will still be quite bulky, reflectors, lights and 2 or 3 ally cases of cameras & lenses. With that in mind and the mileage, either use the Marea or flog it and if you want to stay with FIAT bite the bullet and trade up to (maybe) a Stilo SW JTD.
That way you'll have a car that will last you for another 100K miles. Don't forget though that if your Marea does 30 mpg on a run, 40ppm will give you £12 per gallon. This might sound good but you will have to have it serviced more often and if you but something newer it will depreciate more quickly than if you just knock around locally. You could also negotiate a better deal whereby he could, for instance, pay for your servicing and claim it back against his tax as he will probably be self employed and presumably you won't be. Paying you 40ppm he will be getting a hell of a deal as he won't have to pay for a car, its servicing, tax, fuel, insurance or depreciation.
What it comes down to it,do you want the job? If so it has to be either the Marea or something newer but cheaper to run.
That way you'll have a car that will last you for another 100K miles. Don't forget though that if your Marea does 30 mpg on a run, 40ppm will give you £12 per gallon. This might sound good but you will have to have it serviced more often and if you but something newer it will depreciate more quickly than if you just knock around locally. You could also negotiate a better deal whereby he could, for instance, pay for your servicing and claim it back against his tax as he will probably be self employed and presumably you won't be. Paying you 40ppm he will be getting a hell of a deal as he won't have to pay for a car, its servicing, tax, fuel, insurance or depreciation.
What it comes down to it,do you want the job? If so it has to be either the Marea or something newer but cheaper to run.