Improving Fuel Economy

OK, you know driving isn't good for the environment, but you're going to do it anyway. Here's how to substantially increase your fuel economy without buying a new car:

1- Drive deliberately; accelerate gradually. A car uses a lot of fuel when it's accelerating rapidly.

2- Drive 55 mph on the highway. This makes a huge difference. It maximizes fuel efficiency by reducing wind resistance, which exponentially increases with speed. This reduces gas consumption by more than 20% relative to a speed of 75 mph. 60 mph is almost as good, if 55 is to slow.

3- Draft a truck. Large trucks with flat, square backs leave a massive low-pressure zone behind them, which you can exploit to save gas. At 20 feet behind a standard 18-wheeler, you will use about 27% less fuel. If that's too close, you still save 20% at 50 feet, and 11% at 100 feet. Be careful because trucks have a blind spot behind them, and some truckers do not appreciate drafting.

4- Keep your car well-maintained. Clogged filters, faulty oxygen sensors and flat tires all hurt fuel efficiency.

5- Lose the cargo. The more weight you have in your car, the more fuel is required to get it up a hill or accelerate it.

6- Turn off accessories. AC is the biggest power drain, but the fan used to circulate air also draws power.

Convenience Store Survival Training

I was on the road yesterday driving to a county court to defend myself (unsuccessfully) against a speeding ticket. I reluctantly stopped into a convenience store on my way back, to see if there was anything I would eat for lunch.

I actually did find two things that were palatable and not too unhealthy: canned sardines and toasted cashews. The total was $2.50, affordable even for a grad student.

The sardines were canned in "tomato sauce", which I realized later contained soybean oil. Oops. Well I suppose when you get your food at a convenience store, you have to expect such things.

The main thing that bothered me was the trash. I posted a mugshot (above) of the can, fork and plastic bag that I either trashed or recycled as a result of the meal. The total volume of trash was probably almost as much as the total volume of food.

I think if you stick to nuts, canned fish and fresh fruit, it's possible to survive a convenience store stop. And Baby Ruths. Those are healthy, right?

Two Tons of Steel

While I was waiting for the bus one morning, I decided I'd count cars to see how many were single-occupancy vs. two or more. I came up with a ratio of roughly 20 single-occupancy vehicles for every multiple-occupancy vehicle. The multiple-occupancy vehicles were most often work trucks, containing plumbers or construction workers going to a job.

People have to get to work. Maybe they don't have public transit where they are, or maybe they just don't feel like sitting next to smelly commuters, but for whatever reason, here in the U.S. they drive their cars.

The average American weighs about 180 lbs. Due to our love affair with SUVs, the average American car weighs over 2 tons and climbing. That means every time a person drives a single-occupancy vehicle to work, they aren't just expending the energy it takes to move 180 lbs 15 miles. They're also lugging around a hulking two-ton chunk of steel and plastic. The passenger of the average single-occupancy vehicle is only about 1/24 (4%) of the mass that's being moved to and from work. That's ridiculous!

Of course, we make up for the big weight of our cars with big engines so they can go vroom. That adds up to a lot of gasoline burned, for no clear benefit. In other words, most of us could easily be driving vehicles that perform the exact same function but burn 1/3 the gasoline. I'm not talking about space-age technology here; these vehicles are already on the market.

Why do we commute so inefficiently when better options surround us? I think there are several reasons. First of all, gasoline is dirt cheap. We have no incentive to be efficient beyond our own consciences. Even with the recent price jumps, gasoline doesn't cost much more than it ever has, if you adjust for inflation. In Europe, where high taxes mean gasoline can cost four times as much as in the US, vehicles are lighter and more efficient.

Secondly, we've always been a very car-centric society. Cars appeal to our desire for independence, power and control. A large, powerful car is a status symbol in the US. We've inherited these attitudes from previous generations and we're just beginning to question them. Are there healthier and less wasteful ways of getting to work?

There are, and many of them are very simple. The first and simplest is a carpool. If we put two average Americans in our two-ton car, all of a sudden the people are 1/12 the weight of the vehicle. With four people, the number jumps to 1/6. We've just made our vehicle almost four times as fuel efficient, per passenger! 1,000 lbs per person is still a lot of weight to be lugging around though, so let's look at some other options.

If you are on the market for a new car, fuel-efficient models abound. The new hybrid cars by Toyota and Honda are twice as efficient as their non-hybrid brethren, and not much more expensive. Some people truly need SUVs for their business, but I have good news for them too: there are now hybrid SUVs as well. That's right ladies and gentlemen, they're the most efficient gas guzzlers on the market.

Public transportation is another great option where it's available. Buses are big and heavy but they can accommodate many people.

Now let's get into the really efficient vehicles. Motorcycles and scooters weigh from 250-500 pounds, meaning that a passenger would be from 1/2 to 1/4 the total weight of the vehicle. Now we're beginning to make some sense. Certain scooters can go over 100 miles per gallon of gasoline.

An even better option is to use vehicles that don't burn gasoline at all. A bicycle weighs about 20-30 pounds, making the passenger about 9/10 of the total vehicle weight. That weight ratio might change as the average American loses some weight however. Even if you factor in the extra food you eat when you cycle regularly, it's still terribly efficient. Best of all, bikes allow us to get exercise and feel the sun for a while.

The title for the most fuel-efficient and low-tech vehicle around goes to feet. When using a pair of these, the passenger is 100% of the weight of the vehicle. You can walk until you wear them out and you still won't have burned a single molecule of gasoline. Now that's efficient.

Thanks to lairdscott for the CC photo.

The French Paradox

According to the World Health Organization, 82 out of every 100,000 French men between ages 35 and 74 died as a result of cardiovascular disease (CVD) in the year 2000. In that same year, 216 out of 100,000 men between the same ages in the U.S. succumbed to the same disease.

According to the Food and Agriculture Organization of the UN, during roughly the same time period, the average French person ate slightly more total fat and almost three times more animal fat than the average American. Animal fats came from dairy, lard, red meats, fish and poultry, and contributed to a much higher overall saturated fat intake in the French. This has been called the "French paradox", the paradox being that saturated fat is supposed to cause CVD.

Researchers have been scrambling to identify the factor that is protecting French hearts from the toxic onslaught of saturated fat. What could possibly be preventing the buttery sludge coursing through their arteries from killing them on the spot? One hypothesis is that wine is protective. Although the modern French don't actually drink much more alcohol than Americans on average, wine contains a number of molecules that are potentially protective.

One of these that has gotten a lot of attention is resveratrol, an activator of SIRT1, a deacetylase enzyme that is involved in stress resistance and lifespan regulation. But lo and behold, it turns out that there isn't enough of it in wine to be helpful. Now researchers are turning their attention to a class of molecules called procyanidins, but I suspect that this will turn up negative as well. The protective molecule is probably ethanol, but no one wants to hear that because it doesn't resolve the paradox.

As a person with a French background who has spent quite a bit of time in France, the notion of a French paradox is insulting. It implies that the French are eating an unhealthy diet, but are somehow miraculously protected by a compound they're ingesting by accident. Any French person will tell you there is no paradox. When you make a commitment to seek out the freshest, most delicious ingredients available and cook them yourself, your diet will be healthier than if you count the grams of this and that on your TV dinner.

There's more. Americans consume almost twice the amount of sugar as the average French person. I find this surprising, given the large amount of sugar I've seen on French tables, but I think it speaks to the huge amount of sugar we consume in the US. Much of it probably comes from the high-fructose corn syrup in soda. I'll save my rant about that for another time.

Another thing that stands out about French food habits is the absence of snacking. Mealtimes in France tend to be well-defined, and grazing is looked down upon. I think this is probably essential for maintaining adequate insulin sensitivity in the face of (delicious) refined carbohydrates like baguette.

And finally, the French enjoy their food more than the average nation. I wouldn't underestimate the value of this for health and overall well-being.

So what was the paradox again? I can't remember. Maybe a more parsimonious explanation of the data is that saturated fat isn't so bad after all, and enjoying wholesome food and limiting sugar is the true prescription for health.

Thanks to Gaetan Lee for the creative commons photo.

Real Food II: Vinaigrette

Store-bought salad dressing is a crime against humanity.

'Ranch', '1000 Island' and other industrial monstrosities are a good way to put yourself underground in a hurry. From bottom-rung oils to artificial preservatives, they contain some of the most frightening ingredients you're likely to see in a grocery store.

Homemade salad dressing is one of the simplest, tastiest and healthiest recipes I know. If made properly, it's creamy, light and flavorful. I consider it my civic duty to spread the word about homemade salad dressing, also known as vinaigrette.

For a medium-sized salad, put two tablespoons of vinegar into your empty salad bowl. Add a pinch of salt and a tablespoon of dijon mustard. Add three tablespoons of olive oil and stir until it's creamy and homogenous. That's it! Add your salad, toss and enjoy. The tossing is essential.

I always use extra-virgin olive oil. My favorite vinegar is unpasteurized, unfiltered apple cider vinegar. You may add garlic, tarragon, mint, basil, green onions or miso to your dressing for extra flavor.