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Sub 15mpg is pretty normal for 90s 2wd 6.5L suburban.
I believe they come with 4L80E transmission, which isn't super efficient and they tend to have 3.73 or 4.10 gears.
Check out dieselplace dot com.
I say if you are using trying to flush the transmission get a pan with a drain plug and use the cheap fluid that is only about $10 a gallon.
The coolant heater is in the water jacket, if its working, after you plug it in you should start to hear a crackling, sizzling or hissing sound from the water in contact with the element boiling. If its quiet and not sparking when you unplug it its likely dead.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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