I have found that driving habits (or shall we say "technique") does make a significant difference.
My own commute is about 50 miles one way and I ran a simple experiment over the course of a couple weeks to see how far I could stretch my mileage. My drive is about 35 miles at highway speed ann 15 miles in heavier/slower traffic. Driving normal, I get about 32mpg over time. However, while driving with the intent to increase mileage, I was able to approach 39 to 40mpg. This was done by slowing down from 75-80 to 65-70mph, staying within "drafting" distance of other vehicles, avoiding hard accelerations, and popping the tranny out of gear to coast whenever possible.
It seems odd that simple old common knowledge is being ignored though. Such as we have known for decades that a simple air dam at the bottom of the front of the vehicle will greatly reduce air drag from the bottom of the vehicle. But no one builds in air dams on a regular basis, except for cars like Alfa Romeo, Porsche, etc.
While direct injection costs more because of the high pressures needed, it can be exrtremely efficient. That is because it eliminates pre-ignition, ping, and knock. That means compression ratios can be increased dramatically, getting much more HP out of the same fuel combustion. The need for premium gas is also eliminated.
It also brings back the potential for going back to 2-stroke engines, that can get twice the HP for the same engine weight. With direct injection there is no mixing oil and gas or chance for excape of unburned fuel.
Actually motorcycles are much safer than cars. They have far fewer accidents, mostly because they are so manuverable they can easily avoid them. Same is true of smaller cars. And in fact, if you are in a one car accident, small cars are safer, because it is the weight of the back end of the car that tries to crush the passenger compartment. Trying to make cars heavier so that you kill others instead of just making all car lighter and safer, makes no sense at all. If all cars are lighter, there will be far fewer deaths.
Talking about automation, what we need also are more intelligent cruise control systems. For electrics/hybrids it makes a big difference if power is constant rather than speed is constant. Allow the cruise control system to slow down the car on climbs and speed ups on descents. With a definable window of speeds for the cruise control, highway efficiency can improve further.
Based on the following government site, bad driving habits can affect milage as much as 33%.
Although I'm not an agressive driver so my milage wouldn't improve dramatically from an optimal pattern, I can hardly wait for autonomous vehicles. Let the machine do the driving! Traffic lights won't even be necessary.
I suspect even our most optimistic forcasts of improved traffic flow and milage will ultimately prove to be pessimistic.
Absolutely right. The more efficient the car, the more carefully the driver has to drive to extract this performance. A 10mpg car is not going to see too much degradation in performance when the driver drives badly. Hybrid and high fuel efficiency vehicles will see dramatic reductions in fuel efficiencies by poor driving technique. The car must be intelligent enough to be able to help these poor drivers while not compromising safety.
Truchard will be presented the award at the 2014 Golden Mousetrap Awards ceremony during the co-located events Pacific Design & Manufacturing, MD&M West, WestPack, PLASTEC West, Electronics West, ATX West, and AeroCon.
In a bid to boost the viability of lithium-based electric car batteries, a team at Lawrence Berkeley National Laboratory has developed a chemistry that could possibly double an EV’s driving range while cutting its battery cost in half.
For industrial control applications, or even a simple assembly line, that machine can go almost 24/7 without a break. But what happens when the task is a little more complex? That’s where the “smart” machine would come in. The smart machine is one that has some simple (or complex in some cases) processing capability to be able to adapt to changing conditions. Such machines are suited for a host of applications, including automotive, aerospace, defense, medical, computers and electronics, telecommunications, consumer goods, and so on. This discussion will examine what’s possible with smart machines, and what tradeoffs need to be made to implement such a solution.