Sort of related to some of the above and if the budget will go that far is getting the car dyno tested.
This will optimise the setting in as close as you can get to real road driving and a decent dyno operator will also be able spot things like a tight wheel bearing or a slipping clutch which may be hard to identify in daily driving.
Other thoughts are to find a performance based board for you car and see what the options are in that direction then take what you need for upping the FE.
A lot of the higher performance mods can be usefully translated over to giving better FE.
Welcome to the place as well and long may you six run.
Cheers , Pete.
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