7.3 Powerstroke Question
This is a respected engine, but compared to today's diesels it's a dog pulling a load. I have heard that it was tuned down below its potential between International and its getting into the Fords. I...
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Following up, we just completed an 800 miles trip using the heavy tow tune with our 10,000 TT plus 800# of ATV and gear in the pickup bed. Fuel mileage for the first 600 miles was 11.5, but 9.9 for the last 200. No significant wind or elevation changes, but oddly, to me, the last 150 miles was at 45 to 50 mph with quite a bit of curves requiring slowing to 35-40 and accelerating back to the changing speed limits. The better mileage was on regular highways and interstates running a pretty constant 62. The extra torque and hp made a huge difference. The engine never seemed like it was working.
