Just as Winter is starting to wane, I finally blocked the grill.
There’s two main purposes to block the grill:
- Reduce the cooling effect so the engine warms quicker and stays warmer longer; and
- 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.