I use the biggest machine with an extra wash and extra rinse. It cost me $8.75 per load. And takes about 45 Minuets from start to finish. I do 2 weeks worth of laundry. Using 2 of the biggest washers. Both with extra wash and extra rinse. And I dry in two dryers. My entire load of laundry from start of wash to entirely dry. Cost me $20.00. (Actually a little less, but I spend the extra change to make sure my laundry is entirely dry, no dampness.).
3.50 to 7.50 depends if you are using a 2,4,or 6 loader and if you what heavy soil or any extra's.
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