Retire Early?

Hubby sent the link to this article earlier this afternoon. It's all about retiring early and living a pared down lifestyle. Sounds great, but I'm a bit apprehensive about giving up certain luxuries like restaurants and travel. But I'm convinced this will persuade Hubby to buy out our BMW lease so we can drive it for 20 years. Okay, that's pushing it I guess...but, I've grown quite fond of the BMW. Wonder if we can retire early...