Thanks for all the great feedback , my confidence is rising ! Your help, combined with my adventure yesterday confirmed to me that this is the right fit for my truck and me. I drove my truck on hwy 75 from dallas to vanalsten tx. yesterday ( about 50 miles one way ) and by my best calculations I was getting about 8 yea 8 mpg ! I was keeping it at about 55 mph and though it was running strong it was really roaring !