RE: Grill Block - I'm running a VAG 1.9TDi PD with a 75% grill block, and although I haven't driven it through summer yet, I'm confident that it's not even going to trigger the radiator fan. Even with a new thermostat, it still takes 7-11 miles for the engine to come to full operating temperature (route is mostly 50-70 mph).
Block heater is probably your best bet. Provided you're not at the Mall all day you should have enough residual heat left in the block to have a relatively quick warm up.
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