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Yea I think the ~1500 or so rpm is a pretty good shift point on a diesel as long as the transmission is geared for it. The 2nd to 3rd shift is a massive one, if I shift at 1500rpm, it drops to like 800-900 rpm vs other gears around 1000-1100rpm.
My last tank fill up wasn't great, about 16mpg. The whole tank was short trips, no block heater, and every start was cold with 2 glow plugs bad so idle time to warm up etc. Not terrible, but clearly the block heater will save a ton of fuel. I haven't drove the truck for a while since it's at my dad's. He put the block heater in and I think he was planning to throw the other bank of glow plugs in. I bought antifreeze to replenish what came out, and engine oil to do a change since I don't know when it was last changed.
On a side note, I've been driving the Lexus, and it's been super cold here that the mpg has dropped tons for it too. It's around 15mpg for the last fill up, it normally runs around 18-20ish with no mods.
I haven't really worked on the truck, I don't do too well working outside in the extreme cold (15F and lower). I did pick up some parts vehicles to part out/scrap from a neighbor though, so that forced me out in the weather a little.
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