@Dammit bit of a left field suggestion, but would you consider a LPG conversion on your VW camper? If you are planning long trips it could pay work out on fuel savings. Plus its a cleaner fuel so extends the engine life.
LPG needs spark ignition. There are various bodges to run a mix of diesel and LPG, but you're still burning diesel.
If you're going to throw money at the problem, Mercedes and Citroen both have LWB electric vans with decent range batteries.
When a bifuel vehicle is running on LPG is it also using some of the other fuel (petrol or diesel) then?
@grams started
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@Dammit bit of a left field suggestion, but would you consider a LPG conversion on your VW camper?
If you are planning long trips it could pay work out on fuel savings. Plus its a cleaner fuel so extends the engine life.