If she was able to take advantage of slipstreaming it would be better.
I find that when towing the caravan at the required speed limits and using slipstreaming with lorries I can get and additional 5 -7 mpg. The lorry speed limit is the same as mine towing the caravan. You can feel the difference when you get in the zone at about 100 to 150 meters behind a lorry but type of lorry makes a bit difference.
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