El Fuego!, Sonic Burst, Aux Rockets, Fuel Cannisters, Repellers

Day 1: RC helicopter lvl 2, Aux Rockets, lvl 1
Day 2: Sonic Burst instead of RC helicopter, then put the rest of cash into Aux rockets
Day 3: Purchase El Fuego!, get your 2nd sonic burst, and as before, put cash into Aux rockets x2
Day 4+: Upgrage sonic burst firsts first evenly, then with the cash left over, put into El Fuego, then Aux Rockets

There is a chance you may hit objects and it could ruin your run, use the aux rockets to correct yourself and it is easily and quickly doable in 6 days

This follows the same method as the previous speedrun, once you get 3x sonic boosts and enough lift, you will want to add some repellers and fuel canisters.

Again as the method stated above, cash goes into sonic bursts, then El Fuego!, then repellers, then fuel canisters. You will want to do repellers first, and once you get El Fuego high enough you need 3x repellers and 1x fuel canister. Similiarly to before, you may hit an object and it will ruin your run, but just repeat again and you should have no problems.

The reason for this method is that with no launcher, the sonic boosts will get you much more cash for high speed bonus, earning you more per day. Also you don't need too high level BP upgrades, the standard +3 will work.