My First Post! Questions regarding FE and my Nissan.

[Maggio]

Hello everyone, (I have a 1990 Nissan Pulsar NX 1.6L)

I've been concerned about my fuel economy for a few years and would like to get some questions answered. I have been using coast in neutral, sometimes use P&G, light timing techniques for a while.

1. Is there a way to get a scan gauge (similar) item to monitor my fuel consumption? My car is older than 1996 and not on the list.

2. I live in Manitoba where people routinely use block heaters in the cold. Is it safe to block off some or all of my grill? Even past winter? It is a small grille to begin with, and I am unsure if my temperature gauge actually works.

*3. Most importantly probably is I would like to know my most efficient gear/speed. I have 4 banger a 1.6L SOHC engine. Would going 60km/h at 2000rpm (5th) be worse or better than 60km/h at 2200rpm (4th)? Would maybe 60km/h at 3000rpm (3rd) be best? I am not well informed of how the torque curves or whatever work, and know than lower rpm is not always the best option.

Thank you for your time!