Fuel prices for a Campervan trip: Estonia, Latvia, Lithuania - Cheapest Diesel?

Hey everyone, My partner and I are about to embark on a campervan road trip through the Baltic States and are super excited! We're coming from near Stockholm with the ferry to a port near Tallinn. From there, our route will take us through Estonia, Latvia, and Lithuania before heading to Poland and back home to Germany. We're currently trying to plan our budget and would really appreciate some local insights on fuel prices, especially for diesel. • Which of the three countries (Estonia, Latvia, Lithuania) is currently the cheapest for diesel? • Are there specific regions or types of gas stations (e.g., specific brands, off-highway vs. highway) where we should fill up to get the best prices? • Any other tips on fuel for a campervan traveler in your beautiful countries? We've been doing some research online, but nothing beats firsthand knowledge from the locals. Any advice would be a great help for our trip! Thanks a lot in advance!