Using the fan, heater

[BailOut]

Originally Posted by colb

I suppose a Yaris forum, if anywhere, would be the place where you'd expect to find people who can't get it through their heads that saving energy doesn't matter if you're not saving enough to notice.

Getting a tenth of a percent better gas mileage (like driving without DRLs during the day, or the fan on full blast, or using windshield wipers in the rain) just doesn't matter. It will not affect your wallet. It will not affect CO2 emissions. Does it really count as saving energy if there's no possible way you can ever notice it? Nope, not in the real world. If everybody saved a tenth of a percent of gas mileage, would it reduce our dependence on foreign oil? Nope.

This is often called "good engineering judgment" or alternatively "common sense."

You completely missed out on the first tenet of engineering by failing to focus on the original problem. The original question was whether using these things uses more fuel, which it indeed does. The question was not whether it was worth worrying about or not.

Some people may not care but hypermilers strive to stretch every gallon of gasoline for all it is worth. 0.1% is a totally arbitrary number and may not sound like much but when you add it up over the course of your lifetime it becomes an easily trackable amount. For example, if you average 32 MPG then you use 0.03125 gallons per mile. If you drive 15,000 miles per year it requires 469 gallons of fuel. If you maintain this pattern from age 16 to age 75 it requires 27,656 gallons of fuel. 0.1% of that is 28 gallons, or 3 fill ups.