Lent my buddy my TAG II, http://www.dieselpowerproducts.com/tag for an extended towing vacation, Montana to New Mexico and there abouts the long way.

'97 3500 modified with around 350hp pulling a 13,000 lb fifth wheel. He has kept mpg records for every tank, figured by hand, since the truck was new. Beside a very much noticeably quieter turbo, over 6800 miles and 22 fill ups his average towing mpgs increased 1.4 mpg with the TAG II over no TAG.

Best TAG tank was 4 mpgs over his pre-TAG average, some tanks with TAG were the same as the pre TAG average but none were below the long term average. Best tanks were driving in mountainous areas.

In the couple of tanks he ran not towing both were the highest mpgs he has ever gotten at 24.7 and 24.3, that's 2 mpgs over his pre-TAG average. He said it seemed like he was blowing less smoke with the TAG but didn't really notice any egt reductions. Boost on flat land was reduced by 1-2 psi.

Sounds good to me, with the price of fuel nowadays a TAG will pay for itself in no time.
Problem now is getting my TAG back from him, he says it's stuck in there

 

He didn't drive any differently either? That seems like a pretty big difference with something simply trying to make the flow a little closer to laminar flowing into the compressor wheel. Did you notice similiar (but opposite) results when you removed it from your truck?

 

Whats the warranty on the TAG?

Kinda pricy

But I bet it woulda kept that bird feather from destroying my compressor wheel last week!

 

My buddy is older and lets just say very set in his driving habits.
Only difference I'm seeing is lots more turbo noise on my rig without the TAG but I'm busy with harvest lately and haven't been driving off the farm much. Been on the same tank for at least a month.

The warranty is if you don't like the TAG return it for a full refund. My understanding is very few have. The Diesel Power Products folks are very knowledgeable and one of those vendors who are a pleasure to do business with.

 

I am impressed with those results and it looks to be a long enough test to be a good representation of the actual gains. Most who have reported mileage increases are very similar with the best gains towing at elevation.

 

Bill thanks for the report! Its always nice to hear some actual reports from someone who has consistant driving habbits.

Cheers, Kevin