.Execute not available on a type safe Entity Framework query (Include & where)

.Execute not available on a type safe Entity Framework query (Include &
where)

I have a question regarding entity framework queries.
I have a query which is using the Extension methods provided by EF, so i
can use type safe includes and where clause. But as the Include is with a
lambda parameter it is an extension method on IQueryable that returns an
IQueryable in order to chain methods like Where. Include with a string
parameter is a method on ObjectQuery that returns an ObjectQuery. Execute
is a method on ObjectQuery, not IQueryable so it is not available when you
use IQueryable methods.
Is there a way to call .Execute but with IQueryable?
return
this.Storage.Customer.OfType<Preferred>()
.Include(b => b.Order)
.Where(cust => cust.Id == customerId && cust.CustomerType== (int)cusType)
.SingleOrDefault();
Thanks,