I've got one truck where it doesn't hardly make any difference, regardless of speed driven. That's my 85 Ford F250 with a 6.9 diesel, 4.10 axles, and C6 auto-trans. I took a few 1000 mile plus highway trips at 65-70 MPH and got 13.5 MPG. Also took a long road trip through the upper peninsula of Michigan. We drove a couple of days on flat roads at 50 MPH. What'd we get for mileage? 13.5 MPG. Yeah, defies logic, but true just the same.
In regard to super high mileage attempts - we've tried it with all our small diesels. Out 91 Volkswagen Jettas with 1.6 diesels get an absolute best of 51 MPG but 45 is more the usual. Our two 81 Chevy Chevettes with 1.8 diesels get 47-48 MPG at best. We're at a 1500 foot elevation, and any non-turbo diesel loses 1% of its fuel mileage and power for every 328 feet above sea-level. So, that means someone who lives at sea-level should be doing 4 1/2% better then I do.
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Today's Featured Article - The David Brown Rose Badge - by Samuel Kennedy. In the 13th century civil war was raging in England. Two English noblemen were involved in a conflict which became known as the War of the Roses. The Duke of York had as his emblem a white rose and the Earl of Lancaster had a red rose. Today the white rose is the official emblem of the county of Yorkshire and the red rose has been adopted by the neighboring county of Lancashire.
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