Seems to be sitting around 18 mpg so far, similar to the K5. That's mixed city / highway driving (40/60 split). I'd guess around 20 if I was to drive it on the highway at 60 mph
Today I got the brakes finished up. Took 6 trips to town to replace stripped fittings, buy proper flare nut wrenches, brake fluid etc etc etc... I installed a Wilwood adjustable combination valve proportioned for disc/disc to start and still couldn't get a solid pedal. I then installed the 99 disc/disc suburban hydroboost master cylinder and voila! Suddenly I've got firm pedal and wow, the truck has brakes!
The rear circuit still has a hair too much bias for my liking even backed right off as far as possible, but it is real close. If I feather the throttle the rears still lock up just before the fronts do, but if I mash on the binders like in a panic situation, then all four lock up. A good solid stop with enough brakes to just avoid a rear lockup has the truck squatting down on all four corners and coming to a stop in a real hurry. I am very pleased with the results and will absolutely be installing one of these master cylinders on the K5. No more ABS light on in the instrument cluster anymore, and no more ABS crap to cause a soft pedal or random ABS activations due to a lack of front wheel sensors.
Tomorrow I am going to load the Tahoe up with all my gear, and get the rear axle straightened out to keep the truck from driving dog legged. I am going to remove the zero rate block to drop it an inch out back.
Next weekend I'll pull a leaf spring out of the front and if it drops the 2" I am hoping for, I'll remove the 4" block and replace it with a Ford 2.5" block and have functional bump stops out back to boot! I'll then load the truck up, and hit the road to Blazer Bash first thing Monday morning
