Sounds like a reasonable, but not amazing, deal.
Mileage: VX > HX > DX > EX. Probably 3 mpg or so for each step, so at least 5 mpg between HX and EX. You can see below what's possible with the DX.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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