dream garage did some dyno tests with scientists controlling them, I'll see if i can find the video.
Also,
WE DONT HAVE ANYTHING TO PROVE THE MPG INCREASE BUT WE DID HAVE A CUSTOMER THAT ASKED FOR DYNO READINGS BEFORE AND AFTER A TERRACLEAN THE RESULTS WERE:
MERCEDES SL320
2004
3.7 PETROL AUTO
BEFORE: AFTER
BHP : 219 228
TORQUE (NM) :312 326
WE NOW HAVE A PRINT OUT OF THIS WHICH IS VERY HANDY TO SHOW CUSTOMERS AN EXAMPLE BEFORE AND AFTER
T J Costello
Spanners Autocentres Ltd
Coleshill
Birmingham
B46 1HT