I am looking at getting the Kennedy Custom Tune ECM for my '05 LLY, especially with the cost of fuel now as I think the return on cost should be pretty easy with the $4+ fuel costs now. I would like to know what some have seen, especially with the '05 LLY's to make sure I am not getting my hopes up too much. The average since I bought my truck is right at 15MPG but through the winter it drops to high 13's. This is a moderate amount of around town, shorter drives as it is my everyday vehicle (~6 miles to work). My longer runs are usually pulling either a 2500LB jetski trailer or a 3500Lb Boy Scout trailer. I also did take a hit of ~1MPG when I switched to the 265 Revo's, even when adjusting for the difference. All this is hand calculated too.

Thanks for any info.

Mark