VTSS350
Blown VT LS1 450rwhp
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guys - you have to remember it takes a while for the motor to get "run in ' and allow time for it to gain optimal fuel economy
Thats a load of crap - edit I have found it to be a load of crap.
My SIDI now has 20,000k on it and the fuel economy hasnt changed at all. I followed holdens run in procedure to the letter. It gets great economy on the highway, but when your only averaging 25kmh in stop start city trafic the economy is going to be bad.
I was told the same thing when I got my SV6 VZ ute. Once run in the fuel economy didnt change either.