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If the daily drive is under 30-miles (22 miles at 50 mph according to EPA( then pre-heating engine oil, coolant, trans and axle fluid would eventually (long term) show an increase.
This topic comes up on diesel pickup boards as diesels are cold-blooded beasts. One correspondent noted that 90% of the heating benefit could be seen in 90-minutes or less for most situations.
In other words, one might look to see what op temp is for those fluids; what combination of KAT or other pad heaters plus an installed electrical harness to run them would cost after DIY installation; plus the kwH cost on an annual basis to see if the fuel burn reduction worked out.
I tend to think it would, if not for any other reason than component longevity where the owner is scrupulous about fluid working life. But one must first look to see if the vehicle is ideal for use the next 10-15 years over a projected miles limit.
FE is only a sub-set of Economy. The other factors must weigh as heavily to go this direction.
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