I doubt that the FE gains, or the warm-up time difference, are measurable, but I probably could test the difference it gives when using my coolant heater. Normally, after at least an hour of usage, I feel warm air when opening the hood, but with the engine cover that warm air comes out comes out around the edges. Getting better, more permanent insultation is on my to-do list.
Testing how much slower the engine cools down after turning it off would be much harder, if even possible. I'm sure the cover helps, but there are just too many variables to come up with a good testing procedure.
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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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