Hello from Nebraska,
We did a groove on Lonnie and Becky Rogers 2008 Saturn Vue on March 25th. The mileage they were getting before the groove was 19 to 20 mpg.

I just received a call from Lonnie and he told me after the first tank filling following the groove, the Saturn is now getting 5 miles per gallon more!! The mileage now is 25 mpg.

Good news, Good news!!!!!

Here are the temps on their mod after the groove:

Exhaust manifold: 303 degrees before, after 240 degrees.

Water: 190 before, after 179 degrees.

Catalytic converter: Pre-510 degrees!! After-340 degrees Post-296 after 230 degrees

Tailpipe: 134 before, after 108 degrees

Oil pan: 195 degrees, after 178 degrees