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accelerate quickly, get it over with
i would use a lot of throttle (but not WOT enrichment) to let the air flow and skip over the gears. When you accelerate you want the engine using as much air as necessary to burn the fuel most efficiently (the region of volumetric efficiency). Extending the acceleration phase just prolongs higher fuel consumption if the engine is not working at the more efficient higher-load region of the BSFC chart. With no chart you might have to experiment to determine that optimal load region, but the basic pattern and trend is common to all IC motors.
On the downhill ramp, by all means use gravity as your friend and accelerate up to the highway speed before trying to merge. Safest merging occurs when all vehicles are moving at the same speed.
For best fuel use, get up to speed quickly and then coast/glide in highest gear, time the lights and stay off the brakes.
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