I would just like to add that in the colder areas a blockheater will help when its between 40 and 50 I have the block heater on a timer to run for 1hour. within 2 blocks im up to 3 bars on the temp gauge and auto stop feature starts working sooner than before. Above 50 there is not much benefit. In my 20 mile each way commute. I showed about a 2mpg increase on that tank since installing block heater. Now that warmer weather is here I will have to wait till fall to check further with the increase in mpg. I metered what the block heater used in electricity my killawatt meter recorded 2.4kwhrs for 5days use.Thats just under .20c at .08c a kilawatt. This is the cheap version of a plugin hybrid