I placed a DeltaGlider with 2.5 km/s dv budget (RCS included) at the same spot as Maven in your scenario.
Turns out that can get in a circular orbit around Mars @ ~550 km altitude. You'll need 145 m/s for a correction at the beginning of the scenario and 2345 m/s to circularize at an altitude slightly less than 550 km above Mars. That's leaving you with only 10 m/s for another correction, but you won't need it all.
Managing the Delta-V budget after you have left Earth's SOI is not the best time/place to do it. You want to know if you 'll have enough fuel to complete the mission before you even launch. The problem is that IMFD's map program can't provide you with the "Circ" delta-V (that's what you'll need to circularize your orbit upon arrival at periapsis) while you are still on the ground.
TransX is a bit more flexible in that area, as you can see in the pic below (it's from a different Earth-Mars scenario):
You can know what your periapsis velocity (2), capture (3) and orbit insertion delta-v (4) is going to be -for a given periapsis alt (1)- before even launching.
IMFD on the other hand, gives you only the oV (outbound or outward?) and iV (inbound/inward or intercept?) velocities. But if you have a pencil, a piece of paper and a pocket calculator, you can easily figure out how much Delta-V you'll need for both the injection burn at departure and also for the capture/orbit insertion at arrival.
If you are not too happy about doing the math, don't worry. I'll add a link to a spreadsheet calculator at the end of this post.
1. Calculating the Injection Burn Delta-V from IMFD's Target Intercept Program oV value:
Things you need to know:
a) The parking orbit altitude [math]alt[/math]b) The mass of the departure planet [math]M_d[/math]c) The radius he departure planet [math]R_d[/math]d) The value of the Gravitational constant [math]G[/math].
e) The [math]oV[/math] from IMFD's Target Intercept program.
[math]V_{orb_d}=\sqrt{\frac{GM_{d}}{R_{d}+alt}} [/math][math]V_{esc_d}=\sqrt{2} \cdot V_{orb_d} [/math][math]V_{bo} = \sqrt{oV^2+V_{esc_d}^2}[/math][math]\Delta V_{inj}= V_{bo} \ - \ V_{orb_d}[/math]
where, [math]V_{orb_d}=[/math] parking orbit velocity,[math]V_{esc_d}=[/math]escape velocity from parking orbit altitude,[math]V_{bo}=[/math]BurnOut velocity, [math]\Delta V_{inj}=[/math] Injection Delta-V.
2. Calculating the Capture and Orbit Insertion Delta-Vs from IMFD's Target Intercept Program iV value:
Things you need to know:
a) The periapsis altitude at the arrival planet [math]alt[/math]b) The mass of the arrival planet [math]M_a[/math]c) The radius he arrival planet [math]R_a[/math]d) The value of the Gravitational constant [math]G[/math].
e) The [math]iV[/math] from IMFD's Target Intercept program.
[math]V_{orb_a}=\sqrt{\frac{GM_{a}}{R_{a}+alt}} [/math][math]V_{esc_a}=\sqrt{2} \cdot V_{orb_a} [/math][math]PeV = \sqrt{iV^2+V_{esc_a}^2}[/math][math]\Delta V_{capt}= PeV \ - \ V_{esc_a}[/math][math]\Delta V_{circ}= PeV \ - \ V_{orb_a}[/math]
where, [math]V_{orb_a}=[/math] arrival parking orbit velocity,[math]V_{esc_a}=[/math]escape velocity from parking orbit altitude,[math]PeV=[/math]periapsis velocity at arrival, [math]\Delta V_{capt}=[/math] Capture Delta-V (the resulting trajectory will have an eccentricity of 1), [math]\Delta V_{circ}=[/math] Circ Delta-V (the resulting trajectory will have an eccentricity of 0).
Making the calculation the first couple of times and seeing it match the values from IMFD can be fun and rewarding, but it gets a bit tedious later on, so here is the spreadsheet I promised:
Injection, Capture and Orbit Insertion DV calc.
You won't be able to use this one, so you need to go to File→Create Copy, in order to be able to use your own copy.
