On my scangauge I pretty much always use:
Engine load
Coolant temp
Instant MPG
Average MPG
Engine load (LOD) tells me how fast to accelerate, and helps tell me when to coat or EOC.
Coolant temperature tells me when I can turn on heat, and when I'm installing a grill bock if I've gone too far.
Instant MPG is actually not real useful unless I'm being a bit more lazy and don't feel like doing as much P&G.
Average MPG I use to gauge how well I'm doing on a trip. The daily commute I know about where I should be at several points in the trip and I can gauge my driving.
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