Hello All. I was just wondering what i should be expecting out of my truck. I have a 1988 Chev silverado, 6.2 diesel. brand new k&n air filter, and i run it with 15/40 oil, + duralube, 200,000 kilometers on the odo.


Does anyone know what the mpg should be? or what anyone else has had. (its a lond box, cab plus, with 31x10.5R15's) thanks for any info.

18 or 19 mpg on the highway at 70mph.

'84 silverado - 24 mpg everywhere, up hill down hill and around curves. Not much power however.

Would depend on engine - type C with EGR or type J without, transmision type, final drive ratio, tire size, loading and fuel quality.


Use all the posts for reference, but realistic comparison is to identical truck.


Color unimportanthttp://dieselplace.com/forum/smileys/Wink.gifEdited by: gmctd

84 4x4 blazer. 32 inch tires, 3.42 gears. 700r4 tranny.


I get 24mpg everywhere, strange thing is when pulling my 4wd trail rig I run in D and not OD, and still get 22 to 24. I figure it has to do with the engine only turning around 2K at 83mph in OD. That is why i run in D when towing and normally around 70 or 75mph.


I have not checked accuracy of tach in over a year, but speeds are checked with GPS, and I never measured actual tire size, the manufacturers are sometime way off on size designation.


Brian.