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 - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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