Last post on Jan 09, 2011 at 3:18 PM
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Chevrolet Uplander, Pontiac Montana, Oldsmobile Silhouette, Van
#6 of 8 01 montana intake gaskets
Jan 09, 2011 (11:04 am)
Hi, I've recently had the intake gaskets replaced, 200,000 kms/162,000 miles. I was smelling the coolant in the cab and could see some leaking on the engine. Works great, like new except there is a reduction of fuel mileage from 33-34mpg to 29-30. Mechanic does not have any ideas.
Anyone out there encounter same?
#7 of 8 Re: 01 montana intake gaskets [willy30]
Jan 09, 2011 (11:21 am)
Wow! How were you getting 33-34mpg? At best on the highway we got something like 30-31mpg but that was when we were keeping the speed between 65-70mph. We drive across Wyoming and Idaho once a year and since the speed limit is 75, we keep it between 75-79 and get an average of about 27-28mpg (which makes sense due to the higher speeds) depending on the wind. You pretty much have to drive at least 75 or you get ran over by semis (hypermilers would be in danger on these highways).
#8 of 8 Re: 01 montana intake gaskets [neustkg]
Jan 09, 2011 (3:18 pm)
I have to clarify that I was doing 60 mph most of the time, on repeated long trips and this is in Imperial gallons, which are larger than U.S. Gals., also using nothing but Shell gasoline. Alas I can't seem to recover my former fuel mileage.