Hi, we did Portsmouth to Bilbao with a Trail Lite 30 ft rv in April 2022, with the 8.1 chevy V8 8.1 vortec, it was converted to run on lpg and absolutely no problem in getting lpg in Spain, average cost was about £0.60p ltr, did the trip from Bilbao to Calpe over 500 miles in one hit, All motorway AP68 from Bilbao acrossto Zaragoza, then Zaragozato Valencia, then A7 ValenciatoCalpe, left Bilbao about 8.30 on Saturday morning, arriving in Calpe 18.00 same day, averaged 23mpg, stopping for lpg, something to eat and toilets etc, site was camping calpe-mar (Google it) in Calpe, fresh water, grey water, electricity on pitch, nice swimming pool, restaurant etc, stayed for 8 weeks, Best holiday ever, walk to town, walk to beach, loads of cycling paths, and brilliant supermarket right opposite site.