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I normally use instrumtation, but not all the time. I've been swapping the scangauge between vehicles to test out different things and borrowing it out to help friends get better mileage. I'm currently averaging about 32% above EPA. Once summer comes around I'll be disappointed and shocked if I'm not seeing 45% over combined EPA consistantly.
Yeah, you can improve without it. But, there are many techniques that really help to have instrumentation. Specifically I'm thinking driving with load which is an automatic tranny's main technique IMO. Its much easier to visually SEE while your driving what hurts and what helps.
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