Had rear base gasket changed and 50k service. Had small hole in fuel line which was found and changed during fuel filter change. Also had tranny main shaft and bearing replaced due to bearing failure. Before all of this I was getting between 42 and 45 mpg on the Interstate with cruise on running 70-75. Having to get back home quickly yesterday, we took I-29 south out of Brookiings, SD (usually ride the highways) and I'm only getting about 32-35 mpg! I'm going to call Jamie or Keith tomorrow, but this is bugging the crap out of me. I mean 97 miles and 2.79 gallons? WTF happened? Was even carrying less weight than usual since we were only gone for 1 night.
Almost forgot - the plugs look good

 

No one has any idea?

 

I'm simply amaze at what you get now with all the up grades you got. Could be something as simple as a clugged Air Filter, to a new tune on your EFI