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Jim85IROC · 11-19-2009, 11:27 AM

I've had a couple 2.8 thirdgens, both with manual transmissions. I averaged about 18mpg with them both.

I get about 18-19mpg out of my TPI 305 5-speed 88 GTA, and I got about the same milage out of my 85 IROC when it had the stock TPI 305 & 700R4.

11-19-2009, 11:27 AM	#10
Jim85IROC Drives: 1985 IROC-Z Join Date: Sep 2009 Location: Readsboro, VT Posts: 24	I've had a couple 2.8 thirdgens, both with manual transmissions. I averaged about 18mpg with them both. I get about 18-19mpg out of my TPI 305 5-speed 88 GTA, and I got about the same milage out of my 85 IROC when it had the stock TPI 305 & 700R4.