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Hypermiling. The act of getting the most gas mileage out of your car. When you get into it, there are an insane amount of factors that play into it all, from driving habits, aerodynamic car mods, engine mods, power usage, tires, wheels, suspension, etc. the rabbit hole is deep, my friend
Every time I think about how I'd have to drive to do this, the nicest reaction I come up with is "nah, not worth it". Also the people that draft semis are stupid mofos.
Definitely stupid, that is the worst way to save fuel.
Personally, I’m not usually up for getting the best mileage out, but knowing the tips is definitely nice if I know I need to save. Not to mention, the aero mods are beneficial for performance driving too, and it’s a passive thing, which is nice.
Yeah, getting savings from being super close up to a semi-tractor trailer is not worth the risk. Stay minimum 3 seconds back (90m or 300ft at highway speeds). On the bright side, a car flattened by a truck will not use any fuel.
However, pacing with a semi (going at 105km/h or 65mph) from a safe distance behind will still net you savings from not speeding. You can set the cruise control or do whatever fuel saving acceleration pattern you have.
You gotta leave enough room to react and stick out the side just a bit so you can see in front of it just a bit but also you can stop a lot quicker than them.
I generally don't do it with Semis though, and I probably don't get as close as the people you're thinking of. If I'm on a long trip I'll ushally try to find a fifth wheel camper going roughly the speed I want and I'll set my adaptive cruise to the minimum distance. The campers throw fewer rocks.
Also if you're ever drafting make sure to keep an eye on your temperature. Most of the time it should be fine but a hot day and going uphill it could very easily overheat, especially if you've done some of the other hypermilling mods like partial grille block.
I get so stuck on how miles per gallon compares to gas use per time. I've decided that driving faster is better because my car is running for less time.
Almost certainly this is not the case, except maybe in extreme circumstances. My car, for instance, gets approximately 25 miles per gallon average, traveling at highway speeds of 80ish MPH average. If I drop to 70 MPH, I can get 30 miles per gallon.
This is because the ultimate factors in gas mileage are fairly simple. Your engine RPM will increase fuel, and the higher your speed, the higher your RPM is required to be to put you at that speed. The amount of RPM increase needed to put you at a higher speed is more than the rate of engine time running. In other words, increasing horsepower requirements is more costly than engine runtime requirements. You can leave an engine idling for an hour and use less than a trip a few miles down which may take only minutes.
That said, while going slower saves gas, the biggest part will be the acceleration/deceleration parts of it. Accelerating takes much more power in a short amount of time to get your speed up, so the faster your acceleration, the more your RPMs will spike, and the more your fuel consumption is. Deceleration too. Letting your engine coast, or leaving it in gear while not accelerating, means your engine is using little to no fuel and yet is still rolling forward. The more you can take advantage of this, the less fuel used.
In the case of high acceleration and harsh braking, you turn a lot of energy into motion, and then convert that energy to heat for the brakes. If you turn a little energy into just enough motion to get you there eventually, and then let the engine slow down until it almost stops as you arrive, you waste the least energy. Ideal real world is somewhere in the middle.