14 Mack, 4.6 mpg? Can I get better mileage with it?

AModelCat · Sep 24, 2022

God prefers Diesels said: ↑

I was going to trade in a deleted Duramax, and they said I would need to sign something saying it wasn't deleted to transfer liability to myself if there was a problem with the new buyer. But once I told them it was in fact deleted, they didn't want it at all.
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Probably got more for it selling it privately. Trade ins are a ripoff in most cases.

Brettj3876 · Sep 25, 2022

RedForeman said: ↑

mDrive comes either OD or direct. The OD has a top gear ratio of 0.78. You said 1530 @ 70. In the calculator I guessed at tire height for low pro 22.5 (40") and it's about right for an OD transmission, so that's a lucky break.

Seriously, even with the crappy chinesium tires and no roof aero, you should be in the mid 5's at least. Aside from what's already been mentioned, running the overhead and check for brake/bearing related drag. Inflate all tires to max printed on the sidewall until you get rid of them.

Tall 24.5 tires/wheels will get your rpm down to 1370 @ 70 and likely help, even more when you can slow down. Speed + that mid roof with a van trailer is subtracting 1 mpg off easy, if not more.
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Lot of drag with a flat top/ mid. I can't get out of the mid 6s pulling a van with my 93 mid roof unless I'm loaded really light then I can get 7-7.2

The 99 flat top is even worse with a van. Low 6s. That has a really big gap between the trailer

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