With the Fitch installed, we hoped we would see an improvement at the pump.
With the Fitch installed, it was time for us to get some fuel-economy numbers. Our first trip to the pump netted us 23.25 mpg, down from an earlier high of 24.10 mpg. Our mileage had actually dropped, so we looked for a culprit. Since our last test, we had installed a new transmission, but that couldn't be the cause, could it? We got to thinking and realized the billet converter and SFI flexplate we installed might have been just as heavy as the mechanical cooling fan we had taken off (which increased our fuel mileage by 3 mpg), so we unhooked the Fitch and ran our test loop again. Running without the catalyst under the same conditions (constant 70-mph freeway driving) netted us 22.10 mpg.
Once we got our variables out of the way and had some solid test results, we found that the thing actually worked. The people at Fitch also informed us that it may take a few tanks to see significant gains. As for us, we got a 1.15-mpg increase with the Fitch driving under very light load conditions. If you're looking for a way to increase your fuel mileage, you might want to check out the Fitch Fuel Catalyst. At about $300, it isn't a bad way to fight high fuel prices.
Old transmission(Fitch Fuel Catalyst not installed)24.10 mpg
New transmission(Fitch Fuel Catalyst not installed)22.10 mpg
New transmission(Fitch Fuel Catalyst installed)23.25 mpg