This is probably the place to point out that not all lemonade concentrates are created equal.
When I made my batch I used Great Value lemonade concentrate from Walmart. It is "33% reduced sugar," with Stevia added. Of course, Stevia adds no fermentables, though it adds sweetness. Checking the Great Value label, it shows 19g total sugars for 2 fl. oz. concentrate. Not exactly the best reviews for flavor, either. Hindsight. My RHL tastes good, but I'm thinking I can do better next batch.
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Old Orchard is similar to Great Value, with the same 19g sugar per 2 oz of concentrate. Stevia is added to bump up sweetness in this one, as well. Maybe it has better flavor, though I've never tried it and probably won't.
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Minute Maid costs more than the above 2 brands, but has more sugar and no Stevia. It shows 27g total sugars per
1.5 fl. oz. serving of concentrate (which includes HFCS, though I doubt the yeast care). Scaled up to a 2 oz serving, this comes out to 36g total sugars, much greater than the 19g in each of the above offerings.
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Those are just a few brands I find near me. No doubt there are other store brands to look at, YMMV. It pays to read those labels before buying, something I didn't do.