Prius Mods 4 – Grill Block

Just as Winter is starting to wane, I finally blocked the grill.

DEFA cable socket (left of the Toyota badge) and grill block

There’s two main purposes to block the grill:

  1. Reduce the cooling effect so the engine warms quicker and stays warmer longer; and
  2. Improve aerodynamics.

After a sample size of one day, it appears to be working.  I took a few trips today recording 3.3l\100km (according to the Garmin ecorouteHD)  The final trip from Fyshwick to home, at high speed, using A/C and with no particular care or techniques returned 3.7l/100km.  The proof will be in the next few tanks, so I should wait before judgement.

BTW, the Garmin ecorouteHD can display the coolant temperature as a number, unlike the warning light as standard.  Coolant never went over 91°c.

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