I have just done some fag packet calculations Nodzed and I reckon there will be no change from 3k for your trip. I have assumed a petrol Zed and no free accommodation at friends houses. B&B for 14 nights at a minimum of €90 pn is €1260, then 3500 miles at 35mpg is 100 gallons at around £6 a gallon comes to £600, pus getting over or under the channel £175, getting through or over the Alps at €45 each way is €90, then you need food and drink for the day after breakfast which can take at least another €60 per day which is €840. Just those items come to the thick end of £3000 even allowing for my mixed currency workings! Then you have travel insurance, breakdown insurance and probably quite a few tolls. It’s a dear hobby this touring.