I've been testing my own mini theory as to why the wear & tear on my Python was getting upwards of 10,000 + after a long days trading. I would normally push the ship to its max in every situation trying to save time in super cruise, but when I adopted a more relaxed approach I noticed the repair/maintenance cost's were reduced by at least a 1/3 & sometimes half depending on the system your flying in.
Starting with the obvious by avoiding collisions as much as possible.
Stop giving your ships computer a nose bleed by banging it down hard onto the landing pads, you know what I mean when she starts to stutter and you get blurred vision on your cockpit display.
Now the bit you wont like, slowing down, yep! I'll say it again slowing down, Gravity wells or the mass shadow call it what you will but you cant always see the reason your ship suddenly starts to slow down
because you have a restricted view, sometimes the sudden slowing effect of a gravity well is severe enough you get a hud warning telling you to slow down and I mean quickly it's trying to tell it's dum pilot something. Trying to force the ship through these area's of dense gravity at max throttle is going to cost you in maintenance at the end of the day, don't put all your faith into the ships automated slowing response to heavy gravity it's a bit like being forced to run through a stream (hard work eh!) get on the throttle yourself and back off to at least 75% or hit your pre-set. Some star systems are quite void and you can build up a lot of speed and others are so dense trying to get from A to B quickly is impossible.
I'm not trying to back up what I'm saying with a list of stats, nor am I going to argue the point it simply just makes sense, If you've got a mass heavy ship then try this from a 0% maintenance sheet, select a run your familiar with and fly it for a few hours with a I've got a hot date waiting for me attitude. Then try it again the next day with a more relaxed I'll get there one day attitude and compare the difference in maintenance costs.
I'm just trying to be helpful here I'm not critising other players flying, it's your ship do as you want with it I'm just stating what works best for me regading maintenance costs.
Yes big ships cost more to run and it's never going to be as cheap as a Viper no matter what you do and we all know that but if the running cost is hurting you then your probably flying the wrong ship for your playing style and don't get started on that one.
Either try slowing down occasionally or get deeper pockets.