I don't know if this is useful to others as we camper car differently to others but the dust has settled from our 90 day trip to Scandinavia and I have done the mileage and costs sums..
We drove 7789 miles Accrington and back and used 725 litres of diesel. 49mpg due to slow driving of our doblo xl even laden with bikes, packrafts, camping gear, extra food and wine, and surprisingly flat roads. We went round the southern part of Norway to packraft in Sweden then dipped into Finland and visited the top thin part of Norway up to 70.06 N for my 70th year. Not much deviation from the direct route visiting our chosen destinations in a sensible order.
The fuel cost us £1201. As there were 5 currencies involved with varying exchange rates that is a close approximation.
We used a fremtind service tag and we paid £247 through that for Norway Road tolls, bridge fees and Norway ferrys. We had trouble paying their bill in Norway krona NOK with revolut. I still do not know why. We eventually paid by Wise, but the problem dissuaded us from the 3500 NOK deposit for 50% discount on Norway ferrys, then used more ferrys than expected. Ontop of those bills we crossed the channel, return with dfds for £138 and crossed the helsingor ferry to Denmark to visit a school friend there for £60. Total £436.
Food cost us £1108 again a close approximation as the British and to an extent other currencies fluctuated due to the war and politicians. We stocked up on wine, and costly durable foods in the UK and Germany as Sweden and Norway are expensive. The UK food is not included, nut butters and olive oil. We also foraged. Norway has bilberries in quantity, respberries, cloudberries, lingon berries, and crow berries, the last are full of seeds so undesirable, but bilberries and lingon berries we ate significant quantities. We picked 5 types of mushroom that I identified.
We did not pay for camp sites or water, or eating out and less than £5 for parking. We did not visit any attractions with an entry fee. Lpg cost us £20 even refilling in Belgium on the way back. No breakdowns, no accidents, no medical problems.
Mobile data cost us £72. 3 sims x 12gb with Smarty who luckily forgot to cut us off after 2 months
Total £2840.
It was not as expensive for us as we feared and Norway was beautiful. We plan to go again to do the southern part.