Re: [Amc-list] Gas Miliage?

["Armand Eshleman" <aje1@xxxxxxxxxxxxxxx>]

Funny part about all this is when I bought the car as a kid in 72, it would
routinely do 18 mpg on the highway.
By the early 80s after I'd rebuilt the carb, it dropped off to maybe 16 mpg
on the highway. Remember these
figures are with the slush box automatic in it. Then I put it away for 18
plus years.
I really like your idea about the efficiency of the 304, I just can't
understand why what should have helped improve
mpg seems to have hurt it. I think I need to go through the ignition and
stuff again like Jim suggested, I think my
troubles are there somewhere.
The engine is all original except that I took the heads off around 90,000
miles and had the valves reground because one
exhaust was not sealing. That was 25 years ago, shortly after that I put the
car away. Now it has 106,000.
Armand


----- Original Message ----- 
From: "John Elle" <johnelle@xxxxxxxxx>
To: <amc-list@xxxxxxxxxxxx>
Sent: Monday, June 18, 2007 2:06 PM
Subject: [Amc-list] Gas Miliage?


>
> Snip
> Drove the car to Spencer Iowa and back a week ago yesterday. About a 114
> miles on the
> odometer, used 9 gallons of gas, that's 12.66 mpg. That sucks!
>
> Remember it's a stock 304 with the Fomoco 2 bbl, 2.87 gears, G60-14
> tires
> and T-5 manual
> with .63 overdrive. I wonder if running in 4th gear instead of 5th would
> be
> better. Gotta get a
> tachometer so I know what rpm its running at 70 mph.
> Snip
> That's inneresting!
> My 77 Matador auto/w what ever rear/G70-14/304/Fomoco 2bbl would knock
> out 11 mpg any day of the week but with a 22 gallon gas tank it did not
> bother me all that much, however-
> My '70 Donohue 390 w/open chamber heads/Isky cam/Carter 625 cfm 4bbl/
> Free flows/H-pipe and duals turbo mufflers/3.15:1/T-5 w.63 Overdrive
> would knock down 21 at a sustained 70 although it rarely got much better
> than 10 around town.
> My personal feeling on something of that nature is if you can get the
> engine to develop power efficiently gas mileage will improve.
> A 304 2bbl engine is not an efficient package. Or at least mine never
> was.
> John.
>
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