1. Move the ScanGauge higher up on the priority list.
2. Great to know you and your fiancee both EOC. Your 2.4L Altee has to use EOC to get any better on FE. For comparison, my wife is so tentative a driver, it is a hazard to have her glance at the MPGuino, let alone using any EOC.
3. Alternator delete is a bad idea, if you are going in for aggressive EOC. I guess that high up north, you would also be required to have permanent DRL, at least. I am perpetually worried about not being able to crank. Your weather will further exacerbate the battery situation. However if you have convenient ways of charging the battery through the mains grid, by plugging it in at home or at work, you can think of deleting alternator. It may not net you all that much, but will raise your inconvenience level in using the vehicle immediately. Tread cautiously here.
4. Get the thinner oil at the next change/ next car service. Buy it in advance at leisure, so you don't have to compromise at the time of servicing your car because the best grade/brand is not stocked.
5. SG, grill block, belly pan are stuff that you can do, and not feel any disadvantage, and start saving straightaway. You can probably use the grill block all year long, because of the cold prevailing there.
All the best!
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