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mpg with 4:10s

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Old Feb 14, 2006 | 06:20 PM
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Default mpg with 4:10s

What kind of mpg do you guys with 4:10s get? I thought I would still get good gas millage if I didn't get on it. Going easy I get around 15.7mpg in the city and about 23mpg on the highway. Is this normal or a bit low? What do you guys get?
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Old Feb 14, 2006 | 09:09 PM
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in an automatic or 6 speed?
with my automatic, i get about 16mpg...and i really don't drive it easy

on the highway the other night i got 18.2 mpg...but that was at about 78 mph the whole way which is about 2900 rpms, so i guess it's not too bad.
hope this helps
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Old Feb 14, 2006 | 09:25 PM
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jeez i must be doing something wrong...i get about 190 miles to the tank I believe its a 16.5 gallon tank (correct me if I'm wrong) and thats with moderate driving (not grandma but not speed racer). Any ideas?
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Old Feb 14, 2006 | 09:34 PM
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Originally Posted by HowellSoccer88
jeez i must be doing something wrong...i get about 190 miles to the tank I believe its a 16.5 gallon tank (correct me if I'm wrong) and thats with moderate driving (not grandma but not speed racer). Any ideas?
I would guess that your part-throttle air-fuel ratio is out of whack. That's what was going on with my car, the WOT looked great, but after I got a wideband I noticed that at part-throttle, it was running pig-rich.
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Old Feb 14, 2006 | 09:50 PM
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I got little over 17mpg in city, m6, last tank. That includes a few races and wot runs other then that usually stay below 2k
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Old Feb 15, 2006 | 10:33 AM
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I got 22.5 mpg running 80+ on a road trip last year. Cammed with 4.10's.
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Old Feb 15, 2006 | 12:00 PM
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Originally Posted by okls1
I got little over 17mpg in city, m6, last tank. That includes a few races and wot runs other then that usually stay below 2k
I thought I would get around 18mpg in the city. I have a m6 and I hardly ever get on it to see close to 16mpg. If I romp on it I see about 15mpg. I shift around 2-2500. This engine still has the stock plugs and wires. Think I will see a noticeable difference in mpg if I change those? Engine has about 68k. It also smells really rich at idle. Think the LTs made it run rich?
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Old Feb 15, 2006 | 09:07 PM
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12 all city driving
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Old Feb 15, 2006 | 09:35 PM
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9-10 in the city and 24-25 on the highway in 6th gear.
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Old Feb 15, 2006 | 10:16 PM
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yea 11-19 city just depends on whats beside you and ow your feeling highway 80+ 22-24.4 (24.4 my highest)
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Old Feb 15, 2006 | 10:39 PM
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Originally Posted by Turo
I would guess that your part-throttle air-fuel ratio is out of whack. That's what was going on with my car, the WOT looked great, but after I got a wideband I noticed that at part-throttle, it was running pig-rich.
Did you get it tuned or how did you get the AF leaner?
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Old Feb 16, 2006 | 04:22 PM
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My old cammed '98 Z28 got 27mpg highway and 17mpg city with 4.10's
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Old Feb 16, 2006 | 04:58 PM
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435rwhp h/c combo w/4.10's...19.7mpg city, 28mpg from Miami to Tallahassee.
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Old Feb 16, 2006 | 05:16 PM
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I lost 1mpg when I put the 4.10 gears in. With mods in sig I get 20 mpg ave. 50/50 city highway driving.
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Old Feb 16, 2006 | 05:17 PM
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On long trips I can get 23-24.
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Old Feb 16, 2006 | 07:15 PM
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Originally Posted by slmdLS1
435rwhp h/c combo w/4.10's...19.7mpg city, 28mpg from Miami to Tallahassee.

Details on your combo! I want gas mileage that good
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Old Feb 16, 2006 | 07:18 PM
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Originally Posted by Radcat
Details on your combo! I want gas mileage that good

lol, i just dont get on it from every light. sometimes 1-3-5/6 around town, 6th @ 80mph on the highway.

f13, bo white heads, grot lt's, gomer tune, etc...
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Old Feb 16, 2006 | 09:15 PM
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After a 1300 round-trip on the highway, I was unpleaseantly surprized to only get 18mpg
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Old Feb 17, 2006 | 10:06 AM
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Originally Posted by slmdLS1
lol, i just dont get on it from every light. sometimes 1-3-5/6 around town, 6th @ 80mph on the highway.

f13, bo white heads, grot lt's, gomer tune, etc...
I just started skipping gears around town. I was surprized that it still pulls well in 5th gear going around 35mph. I hope I can get another mpg or two out of it
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Old Feb 17, 2006 | 10:54 AM
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last road trip got me 28 mpg on the hwy. city average is about 17-18.
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