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Unfortunately I don't have any instrumentation in that vehicle since it only sees duty when I need to haul stuff or get out in the snow. Four tanks isn't a very long record, but all four were in the winter, and two were with fourth gear out.
BTW, something else you might consider if you have the auto: my truck couldn't beat 16 mpg until the transmission was rebuilt. Until the rebuild, it would shift late (revving up and then slamming into gear), go in and out of overdrive and, I assume, never lock up the TC. After the rebuild and until I lost fourth, I was getting 18-19 mpg. Also, my truck is geared 4.5% taller due to the larger tires; perhaps that makes up for their horrible rolling resistance. (That 4.5% was verified with two GPS units and is now factored into each tank I report.)
I think I could do a lot better with instrumentation and a 5-speed, but I'm concentrating my efforts on the Clunker, which is my primary commuter (36,000+ miles per year), and which gets numbers I can be proud of.
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