What is the shelf life of this product?

They are sealed so expect a shelf life of a few years.

How many oz for 26 gal fuel tank

Each of these bottles treat 30 gallons. The approximate dosage is 1 ounce for every four gallons. If your fill up is about 16 gallons put in 4 ounces (1/2 bottle). If your fill up is 20 gallons put in 5 ounces. Basically take the gallons added to the tank and divide by 4. Round up or down to the nearest ounce.

Is this also an anti gel?

Yes, it includes Cold Weather Protection – improves diesel pour point up to 40°F (22°C), and cold filter plug point by up to 25°F (13°C), depending on base fuel

Should I had it to my empty tank, then fill it with fuel, or fill first, then dump in the bottle?

I pump a few gallons in if empty (which I don't recommend for fuel system health) them complete the fill up with diesel fuel.

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⚡ Fuel smarter, drive stronger — don’t get left behind!

CLEAN GREEN - Cuts emissions, smoke, and particles for a cleaner, eco-friendly ride.
SAVE MORE MILES - Delivers an average 4% increase in fuel economy, stretching every gallon further.
PROTECT PRESERVE - Lubricant enhancers reduce wear, extending engine life with ultra-low sulfur diesel.
POWER UP YOUR DRIVE - Boosts horsepower by cleaning injection deposits for peak engine performance.
SMOOTH SILENT START - Cetane enhancement ensures easier startups and quieter engine operation.

Stanadyne 38564 Performance Formula is a premium diesel fuel additive that cleans and lubricates your fuel system, increases cetane for better combustion, improves fuel economy by up to 4%, reduces engine noise, and lowers harmful emissions. Compatible with B5 biodiesel and designed to protect ultra-low sulfur diesel engines, it ensures reliable starts and extends engine life.

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Manufacturer	Stanadyne LLC
Brand	Stanadyne
Product Dimensions	33.02 x 27.94 x 5.08 cm; 0.28 g
Manufacturer reference	24349
Is Discontinued By Manufacturer	No
Special Features	Authorized Stanadyne Dealer: 1) Diamond Diesel & Turbo Service
Item Dimensions L x W x H	33 x 27.9 x 5.1 cm
Color	Braun
Item Weight	0.28 g

Stanadyne 38564 Performance Formula 8oz Diesel Fuel Additive, 4 Count

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