Ah okay, so if your Trailblazer was operating at 50% efficiency of MPG (like mine is), that wouldn’t concern you?
The leaky fuel pressure regulator fixed the no start issue?
I’m wondering because low fuel pressure could very well impact the MPG, no?
I had 2 problems. One was the long crank before start, intermittently. If turned KOEO and waited 3-5 seconds, there is no long crank before start. I did replace the fuel pressure regulator for that because I could see a very slight "clean spot" on the regulator body where it looked like fuel was leaking out and cleaning that area. I did a couple other tests for the problem that I stated earlier and decided that the fuel pump is losing the pressure. The pressure never drops below 15 psi when I had a gauge on it for 4 hours. I am convinced it will need the pump. The mpg has not been checked because it has never been out for a "trip", per say. It is strictly around town as a run around items gatherer and used because of the convenient rear hatch.
The other problem was that during an engine crank to start, the cranking would just stop-like the battery was dead but it is not. I have checked for connections, corrosion, voltage drop and all tests good and this problem is very very intermittent. I am convinced that the problem, well known problem for these rigs, is the ignition switch. I knew about this problem when I bought it and when I went looking for a new switch replacement, the only thing available was the aftermarket Dorman or Standard Parts switches and I installed the SP switch and all was fine until recently. Mind you, the intermittent problem I have now was never experienced with the original switch that I swapped out and I actually still have. I did finally find an AC Delco D1426D switch and should have it in my hands by the 29th. It is literally a 15 minute labor time install.
If either of these problems would just fail completely, I could diagnose and know exactly what is wrong. I will get there for sure. I will not give up.