Weather? Maybe this time you had headwinds - not strong enough to notice at the time, but enough to increase areo drag. Maybe the temperature? Rain? Mechanical problem since the last time? More red lights or traffic?
Each trip is different, even if you always take the same route. It's the long-term average which will show you whether a new mod is working.
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is where you're going, not how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
[Old] Piwoslaw's Peugeot 307sw modding thread
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