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post #1 of 5 (permalink) Old 03-21-07, 06:39 PM Thread Starter
DCM
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Gas mileage with handling option

I intend to order a new Grand Marquis when the 2008 models are available and would like the handling option. I hear that the differentials are different with a lower geared rear end.

Does this option reduce the gas mileage by very much?

Thanks

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post #2 of 5 (permalink) Old 03-23-07, 06:12 PM
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Re: Gas mileage with handling option

Depends. What kind of driving do you do? If it's primarily city driving, then a lower rear end will greatly improve your fuel economy. If you do more highway, then a rear end with less reduction will be a better choice.

That said, the fuel mileage will be fairly decent regardless. My dad has a '96 Crown Victoria (basically the same running gear) with 3.27s and it gets 24 mpg highway with the AC blasting. I'm not sure what rear axle ratio the HPPs use, but it's probably either a 3.27 or 3.55 (3.55 is more likely). Bottom line, if you're concerned about highway fuel economy, don't be. You should be able to get mid-20s at least. If you're concerned about city fuel economy, you'll be better off with the lower geared rear end anyway.


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post #3 of 5 (permalink) Old 03-23-07, 07:33 PM Thread Starter
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Re: Gas mileage with handling option

Nathan

Thanks for the response. That was what I was hoping to hear. The rear end with the dual exhausts and larger engine has a 3.27 I think. The smaller engine with single exhaust is a 2.xx ratio.

If it is only a mile or two per gallon less, I will go for it.

Thanks again
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post #4 of 5 (permalink) Old 03-26-07, 08:24 AM
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Re: Gas mileage with handling option

The other ratio would be a 2.73, and the car would be a total dog with those. I have 'em in my '89, and it's not even enough ratio in overdrive on the highway. I'm switching to 3.31 gears this summer.


1989 Ford Crown Victoria Police Interceptor
2bbl Carbureted 351W V8, ported and polished E7TE heads, Edelbrock cam
AOD Transmission with B&M Shift Kit
3.55:1 Positraction Rear Axle
Visit My Car Domain Account Here Updated 1/27/07!
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post #5 of 5 (permalink) Old 04-05-07, 12:13 AM
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Re: Gas mileage with handling option

they all have the same size engine too. :)
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