Question Griggs 30gal Aux Tanks

As an aside - - The quality of the tanks, fit & finish, and welding was strikingly high. I don't know what we necessarily expected, but the tank quality and all related parts exceeded our expectations by a high margin.

The tanks are also surprisingly very light. Like one hand / five fingers light.

Griggs charged $12,000 for the two aux tanks, associated plumbing and fittings, and STC. That's what we did, and we are having them installed at our shop while we are also having other work done.

Installed, Griggs quoted $18,000 ($12K + $6K install) for them to install them at their shop.

Timing has been about 2-3 weeks, which is about the same that Griggs estimated.

Hi Dale,
Excellent.
Thanks for the update. Looks like a great product.
Do you have a estimate of the installation costs and times?

Steve

Update.  Delivered in very well packaged boxes, and initial install.

Hi Dale,

Wow, thanks for sending along all this information on the Griggs tanks. 

Truthfully, I'm not as up on the Seneca world as I need to be and didn't know about the Grigg tanks.

So  you're now in the position to sacrifice 180 # for one more hour of flight time. 

Do you need that kind of range for your normal mission?

Or is this for the occasional long XC?

Please keep me in the loop on your progress.

Thanks
Steve

Our shop has received the aux tanks from Griggs.  We are currently awaiting install.

Griggs was were very responsive in the admin / questions phase - even weekends and after hours, timely in delivery, and honest about all the costs.  No complaints so far.

We received the attached files in the purchase process.  So no install or flight information yet.  Filled, the tanks amount to ~180lbs, or about a person.  (Install weight not known yet)  This would seemingly provide one more hour of flight time at normal cruise fuel flow.

The attached factory-provided install pictures are somewhat difficult to view because they are rotated 90° L&R, but they provide at least some idea.