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What Earth Without People Would Look Like
Raynor writes "Imagine a world without people. What if every human being, all 6.5 billion of us, were suddenly abducted and the planet was left to fend for itself? The planet would heal. 'The sad truth is, once the humans get out of the picture, the outlook starts to get a lot better,' says John Orrock, a conservation biologist. Pollution would cease being created. It would remain around for many years, CO2 taking as long as 20,000 years to be restored to it's natural level, but will decrease. Even if we were all whisked away and our nuclear reactors melted down, it would have a surprisingly little effect on the planet. Chernobyl gives hope to this end. 'I really expected to see a nuclear desert there,' says Ronald Chesser, an environmental biologist. 'I was quite surprised. When you enter into the exclusion zone, it's a very thriving ecosystem.' In the grand scheme of the world there would be little evidence of our existence at 100,000 years. The most permanent piece is the radio waves we've emitted of the last century. As the article puts it, 'The humbling — and perversely comforting — reality is that the Earth will forget us remarkably quickly.'"
As with any vehicle, how you drive can affect mileage. I once had a behemoth 1965 Oldsmobile with a 425 ci. engine. With an electronic ignition and careful tuning, I regularly achieve 18 mpg. When I didn't have time to keep it in tune it could drop as low as 11 mpg.
It's not the engine, it's the size of the vehicle and the tires. Your "behemoth" Olds isn't 8-10 feet tall and doesn't have 4 foot high tires. I seriously doubt these trucks could break 10mpg even driven slowly. There's too much wind resistance, and the rolling resistance from the tires is immense. And that's when cruising; any acceleration is going to seriously guzzle gas because the wheels/tires weigh so much and have so much inertia to overcome.
I knew a guy at work a few years ago who had a jacked-up Chevy truck, and he claimed he got 10 mpg no matter how or where he drove it, in the city or on the highway. And his didn't even have the gigantic monster offroad tires that a lot of trucks have (with four shocks on each side, etc.), just a standard lift kit. I think my 8-10 estimate is probably quite generous.