Your car isn't that fast, so I'd say use all the gears, shifting so that you land at a bit over 2000, and then drop straight into 5th once you're up to speed. Also I wouldn't use wide open throttle before 3000rpm, try 80-90% load.
For on-ramps I accelerate just for fun (I put up with the harsh ride and scraping from my lowered suspension for a reason right?) but I think to save fuel again you'd want efficient acceleration, if you can get up to speed in time using 4th or 5th then maybe just coast down the onramp and build up a little bit of speed with the clutch in, and if the merge is shorter I'd still coast down but give it some gas towards the end of the ramp, or earlier if necessary.
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