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2003 Deville Base
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4,924 Posts
Discussion Starter #1
Over the years most of the cars, trucks and motorcycles I've owned have a sweet spot in MPH. My Mercury likes 78. My F150 likes 68 (it has a trailer tow package & C6 tranny). My last Yamaha Roadstar liked 85. My 2003 DeVille seems to like 81 (which recently got me a ticket). Do your vehicles have a sweet spot?

ken
 

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Gone; ‘09 V, ‘13 V coupe. Curr; ‘14 PG Vsport prem w/Kona interior
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6,177 Posts
I haven't reached it yet in my V coupe! So far it's all been pretty sweet though.
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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The STS appears happiest at 75 - 80 on I-95. (Best fuel economy is at 50 - 55. Above that, power demand [drag] begins to eat away at fuel economy.)
 

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STS 1SF Black V8 2006
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456 Posts
my ford turbo diesel 7.3 @ 1900 rpms and 65 mph can run coast to coast forever. 19-22 mpg depending on hills wind.
 

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White Diamond '03 DHS (with DTS floor shift)
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How do you define "likes"? Mine runs just fine at any speed. :noidea:
 

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1999 DeVille, 2002 DeVille
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4,175 Posts
How do you define "likes"? Mine runs just fine at any speed. :noidea:
All cars "like" to sit at certain speeds. It's hard to describe. Many people here know a -lot- more about gearing than I do, but it's totally a thing. Just let it happen. :lol:
 

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Super Moderator
White Diamond '03 DHS (with DTS floor shift)
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on the STS what's the RPM at 75? On my DeVille base with economy final drive it's just over 2000.
If you re running over 2000 at 70 MPH in a VIN Y Deville, you probably have some degree of TC slippage.
 

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02 Escalade | 02 Corvette "Goldilocks" | 03 Blazer 4x4 | 92 Caprice Wagon LS1/T56
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19,733 Posts
Currently 0 mph.

Because it's missing some essential bits... like an engine and transmission, for starters.
 

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1980 Eldorado, 1974 Talisman, 2004 Volvo C70, 1975 Fleetwood 'd Elegance
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7,960 Posts
Seems like the 87 settles in nicely at 70. Also is wonderful and smooth at 40.
 

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Cadillac CT6 (2019)
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2,284 Posts
Sweet spot for fuel economy ('11 STS) is 65-70; for a smooth ride, just about anywhere on the 'speedo'. (even north of the century mark)
 

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About 70 for LD8 Northstars also. Best compromise for speed & economy. Truck likes it at 65 which will spend most of the time in V-4 mode.
 
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