The fuel is dependent on use. Glide where possible, and only accelerate when needed to climb altitude.
There is more than enough time to get targets in any order when gliding most of the mission, but the following way seems easiest: Off the roof turn left for the bicycle messenger. Ahead turn right and right again. Land and shoot the van / driver. Take off and turn left down the hill. Chase the van (it will take different paths) to kill it. Then fly over the buildings to the Motocycle messenger, his passenger will shoot at you) Last go for the final van and then fly home.
The default controls are pretty difficult, I agree, but I've got a suggestion for you - re-configure your vehicle controls with the next changes (I use these too and it's quite easy, you just need to get used to it). To do these changes, go to main menu
--> Controls Setup
--> Redefine controls
--> Vehicle controls
- At Steer forward / down set Numpad 9
- At Steer back / up set Numpad 6 (after setting this one you'll notice that another control is un-used, I usually set that one to Left Alt)
These are all the changes. The Steer forward / down
control is for getting the plane lower - decreasing height, while the Steer back / up
is for climbing the plane - increasing the height. You can also steer easier using the arrows (simply do multiple key combinations with Numpad 6 / Numpad 9 and arrow right / left. The plane also steers horizontally, but quite difficulty, using Q for left and E for right. To shoot you use the Left Ctrl button. Hope this helps - these are the controls for my planes in San Andreas. The best would be to practice a little with the plane in this mission, and then restart it after you feel like you master the plane.
Besides, look at this
guide for a more detailed Walkthrough. If you still aren't able to pass the mission, you can request in the Mission Help
forum for the mission to be passed. All you have to do is make a new topic, following the desired rules
, and upload your save file here
which we'll afterwards use and pass the mission and send you the save file with the passed mission back to you.