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Old 12-12-2008, 08:58 PM   #1 (permalink)
analogkid455
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Join Date: Dec 2008
Location: va
Posts: 18

442 - '87 Oldsmobile 442
90 day: 26.49 mpg (US)
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comparing two cars

I had a 1987 Pontiac Firebird that got 27 -28 mpg on the highway cruising at 75 mph. It had a carbed chevy 305 v-8, .7 O.D., 2.73 gears and turned 2000 rpm at 75 mph.

Now I have a 1987 442 with a carbed Olds 307 v-8 with .67 O.D., 3.73 gears and it gets 10-13 mpg at 60 mph on the highway. Everything has been checked and gone through and the engine runs perfect. I know the 3.73 gears will hurt mileage, but that much? Cd will effect it also. The 442 is about .4 and the Firebird is around .3 . The only other thing I can think of is, the 307 only had 8:1 CR while the 305 had 9.4:1. Why would I be getting less than half the mileage? My 1974 Olds Omega with a 500hp 468 Big Block Olds with no O.D. and 3.73 gears gets 10-12 on the highway. I might as well drive that!

__________________
1974 Olds Omega 11.85 @ 112 mph on 87 octane 3620 lbs

1987 442 bone stock 215,000 miles 26.7 MPG

http://www.cardomain.com/ride/829130/1974-oldsmobile-omega
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