I filled up this morning. This is my first fill up since using Drew's Brew. I gota lousy 14 mpg (75% city/25% highway). That's no better than before. I do think it makes the truck quieter and smoother. It also starts better in the cold. We've been down to 8F this week and started with no wierd noisesor anything. I'm going to continue to use it, if nothing else it will help keep things lubed.

 

The way to test this (or any fuel additive) that only has a small effect
is with two trucks "convoy style"
where one truck has the additive on the first go round
and then the second truck gets it on the second round with the first truck back to stock.

http://www.etrucker.com/apps/news/article.asp?id=22903

http://www.etrucker.com/apps/news/article.asp?id=60421

sample quote:

The right way to do it
Goodyear goes by the book with Fuel Max test
When Goodyear introduced its new Unisteel tires with Fuel Max technology last year, and claimed that they were more fuel-efficient than its older designs, the company invited the press to come to its San Angelo Proving Grounds in Texas and observe an SAE/TMC Type II fuel consumption test, pitting old against new.

In this case, two identical tractor-trailers — a control rig and a test rig with the same powertrain, mileage, horsepower, GCW, tires, pressure, etc. — were fitted with removable, portable fuel tanks, which were weighed before and after identical runs of at least 28 miles at the exact same highway speed. Fuel consumption was measured by tank weight, and the two rigs were compared as a baseline. Three runs, which must produce results within 2 percent of each other, were made. In this case, the two rigs’ fuel consumption figures were consistently within 1 percent of each other.

Next, the test was repeated, with the control rig unchanged, and the test truck fitted with the component to be tested — in this case, the new tires. Over the course of three runs, with results within 2 percent of each other, the test truck had consumed about 7.5 percent less fuel per run.

Claim made, point proved, case closed.

 

That makes sense. I was just hoping for some noticeable results. Just wishfull thinking I guess.

 

you may also be running the winter blend fuel more since it is colder. . .I'd wonder what your mileage will do when summer time comes around

 

how many miles on your truck? I noticed less benifit as the mileage piled up. I did stop using it for the mileage testing that i'm doing... couldnt be sure on the mix from tank to tank so I figured it'd be better without it.