LOL. Drive at 60-65 on interstates out West and you'll have six-guns blazing through your trunk. Thirty-eight mpg is fantastic; whatever you're doing, don't change a thing. I got 36+ mpg tops on a trip to the midwest this summer.

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'91 300D 2.5 Turbo 330K
'00 VW TDI Golf, 190K
'67 BMW R50/2
'73 Norton Commando Interstate