I say mods support and assist better technique.
The two work together for a synergistic effect.
Many of my mods decrease rolling resistance or air drag; some reduce engine load (e-fan). Without reducing rr and drag, P&G was nearly worthless. It wouldn't coast. Now with hard tires and some aero mods it will coast nearly anywhere, though still loses some speed of course.
Also if you consider adding
SG or SuperMid to be a mod, then that also supports improved technique.
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Check your tire pressure - keep it up !!
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The China Study.
Driving Lean Burn '97 Civic HX, lotsa mods by now! '89 Volvo 240 is semi-retired. I did love that car though!