gadusfly
Our Tundra is much more softly sprung (almost car-like) than my last PU and I find a WDH is absolutely necessary for towing our 2619. Also, you may already know this but Toyota recommends locking overdrive out when towing with a 1st gen Tundra. Transmission failures have been reported when towing in OD. I assume you have the factory towing package with the auxillery transmission cooler -- don't leave home without one :-).
On mpg: We average around 14 towing with a wind-assisted best tank of a little over 15 at 62-65mph. 70mph yields about 13 and it goes down quickly from there. For comparison, our best solo tank was 20.1mpg on a 700mi RT running 62-65 on I-90 that included going over and back across 3500ft Snoqualmie Pass. You can probably expect a 4-5 mpg loss when towing the TM which seems like a lot until you compare it to the 8-9 mpg you'll get towing a full-blown trailer.
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Frank
Former 2002 TM2619 Owner
2005 Toyota Tundra AC 4X2
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