My two cents on this: The miles to empty is based on the average MPG from the day the rubber hit the road! Without knowing how many miles you have "down the road" or the year of your coach to guesstimate, I'll assume the discrepancy is due to the difference between the overall average and your calculation from your RECENT accounting of your full tank to full tank measures.
Safe Travels
2018 Allegro Open Road 36la
2016 Jeep Wrangler
Blue Ox Alpha
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