One more thing to quicken engine warmup are coolant heaters that run on glowplugs. For example, from a Citroen Xsara:
The glowplugs use your 12v electrics to heat the coolant while you drive. Also these 50-150 watts put an additional load on your engine, on 1 hand warming it up even faster, on the other hand increasing the risk of draining your battery if you do it constantly on short trips.
I found these two old threads:
glow plug based coolant heater
Engine suplementary heating - Reduced comsumption/emissions/interior heating
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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