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 - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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