Diesel VW's are the best kept secret in economy, it seems, and highway cruising is where they really shine. I recently had a 56 mpg tank with an average speed of 56 mph. If you're interested, check out the TDI clubs for info on models. You do have to stay on top of the maintenance, but they do hold their value well, and will last as long as the body does. 300K miles is nothing for these engines.
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