Lexus GS 450h – Driving Impressions: Two vivid memories came to mind while driving the 2007 Lexus GS 450h – a day trip through New Hampshire with a stop along the river in Woodstock, and crawling through the slot canyons outside Escalante, Utah. Why? Because they're all smooth on a level you can't forget. The canyons and riverbed can thank Mother Nature, time, and lots of flowing water, while the Lexus GS 450h, or its owner, owes gratitude to designers for their vision and engineers for their brilliant execution. Indeed, the fact that the GS 450h achieves an EPA-rated 28 mpg on the highway becomes easy to overlook.