Dynamics CRM 2011, Select Multiple entities in single call

Issue is, currently we are calling all entities seperately, which makes WCF call earch time.

I am trying to implement solution, in which I will call seperate entities in one go, so that in 1 WCF call I have all the master data.

So Sql Equivalent will be Select x from Entity1; Select y from Entity2

I am using QueryExpression & then calling RetrieveMultiple(query) method.

I found http://msdn.microsoft.com/en-us/library/jj863604.aspx, which says that I can use Multiple request, but  I also found it is used for Create, Update, Delete & Not for Select.

Can you please guide what all option I can go for.