Hi Lethagized,
Friends of mine have driven from South Wales to the Varna area a couple of times (2007 & 2008) - they used the
ViaMichelin Route Planner to initially plan their route (
shows toll costs, additional road taxes, etc., in its route calculation). For example, a test route from Birmingham to Balchik (
using 'recommended route') shows an estimated cost of €283.23, of which Tolls = €2.22 EUR, Petrol = €261.27 and Road taxes = €19.74 [
Austrian & Hungarian motorway tax (10 days) and Romanian (1 day)].
The first year they entered Bulgaria from Romania, but said that they found crossing Romania the worst part of the journey roadwise. This experience led them to enter Bulgaria last year from Serbia (Kalotina checkpoint) and cross Bulgaria via Sofia/Veliko Tarnovo instead.
From my own experience of travelling to Varna from London by coach in 2005, the only border controls of note were entering Croatia, Serbia and Bulgaria itself (via Kalotina) - at that time Bulgaria was the worst/most rigorous of the three, but that was before EU accession.
If you use Google Bulgaria (
google<dot>bg) and try something like "satnav bulgaria maps" you will find several ex-pat posts about satnav use in Bulgaria.
When I was in the Varna/Dobrich areas in March this year, fuel prices were around 1.73 to 1.75 Leva per litre for A95H unleaded and 1.66 to 1.68 Leva per litre for diesel.