Hi,

Did you read the FAQ that was linked?  It's quite clear that if you fetch 10 
entities, then this will be double the cost of fetching 5 entities.


   - *Read operations (Query, Entity Fetch)* Each of these operations will 
   cost $0.07 per 100k operations.

*"Under the new scheme, is it more economical to do a keys-only query that 
fetches 1000 keys, and then do a get() on the 500 of them that I need, or 
just do a regular (non keys-only) query for all 1000 directly?* 

The first is more economical. Fetching 1000 keys + fetching 500 entities = 
$0.0001 + 0.00035 = $0.00045; *fetching 1000 entities = $0.0007.* "

Therefore, the cost of a query which retrieves 5 entities is $0.0000035, 
whilst the cost of 10 entities is double this at $0.000007

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