we took our first trip from west fla to atlanta and our 91 dolphin did great on the road. it has the v6 eng and auto trans and it held interstate speed very well. did better at 65-70 than 70-75. the generator was running the ac in the camper on the way up but we only got about 10 mpg. on the way back we used both ac's and only got 8-9 mpg. also the eng temp went way up with ac on truck, not max temp but close. when we slowed down the temp came down. all in all it was a good and enjoyable trip.