Installed on 2006 Sierra
At first I wasn't sure if it really was working cause I couldn't really see big changes but after about a month I noticed the mpg gains. The power increase was quite amazing too. I feel this is a great product and as they say" you get what you pay for ". Already thinking about upgrading to the IQ.
The economy setting is no benefit, the truck performs as the stock setting. The tow setting is a marginal increase in power with a small increase in mileage. The sport setting is good performance with a good increase in mileage and the super sport setting is difficult to judge mileage because you cant keep your foot out of the throttle. The transmission is good in all settings except the SS, shift pionts are wrong and slow.