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Average MPG for GS400

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Old 08-10-09, 02:38 PM   #1
beaterKU
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Default Average MPG for GS400

Hey guys,

I recently switched over to Amsoil in my GS400. I switched because we started using it in our industrial gear boxes. Right off the the bat I noticed that my mileage jumped to around 22-23mpg. The only mods I have are a K&N drop in and a Carson exhaust. On a recent road trip I got around 24mpg cruising at 75mph. I am going to run a bottle of Amsoil PI through and see if that will help any more. I have always though it got really good mileage considering the sticker says 19mpg on the highway. My daily driving consists of 50/50 highway/city.

What are you guys getting mileage wise?
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Old 08-10-09, 04:32 PM   #2
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i get 20-21. hitting boost at least once a day.
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Old 08-10-09, 09:51 PM   #3
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Car is stock. Only use Chevron, no fuel additives. 80% Highway, 20% City. MPG 20-23.
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Old 08-10-09, 11:19 PM   #4
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17 in the city, 23-24 on the highway.
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Old 08-11-09, 08:35 AM   #5
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18-22 depends on how I hit the
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Old 08-11-09, 06:00 PM   #6
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I get about 20 combined...but got damn near 30 driving my car back to Mn from Pa.

2000GS4
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Old 08-12-09, 05:27 AM   #7
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15-16 around town and around 20-21 on the highway. My mods are killing my mpg. ;(
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Old 08-12-09, 10:49 AM   #8
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gas mileage? lol.....I don't even bother to check anymore...hurts my feelings too much every time I put gas in it. I do know however I can get from North Phoenix to Las Vegas on 3/4 tank....about 12 gallons...at good cruising speeds of 70-75 mph.
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Old 08-12-09, 12:40 PM   #9
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Wow i only average like 20mpg driving my GS300!
sounds like its time for a tuneup
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Old 08-12-09, 01:11 PM   #10
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Quote:
Originally Posted by 5t341th View Post
Wow i only average like 20mpg driving my GS300!
sounds like its time for a tuneup
They say that the gas mileage is almost identical. Don't feel bad, i want to get a 400/430 myself but i have too much money invested in my 300.
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Old 08-12-09, 01:31 PM   #11
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Quote:
Originally Posted by Infamous 1 View Post
They say that the gas mileage is almost identical. Don't feel bad, i want to get a 400/430 myself but i have too much money invested in my 300.
You should still do it IMHO. All your parts can be transferred easily to the GS4. It's just that it would be a PITA especially if you didn't bother to keep your stock parts.
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Old 08-12-09, 02:01 PM   #12
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no power mods on the gs400 here and i use amsoil as well. amsoil is in everything on the car and we get about 23-24mpg. but the wife has a lead foot so when she drives the car all week we get like 17mpg.
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Old 08-12-09, 02:09 PM   #13
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I'm envious of the mileage you all are getting. I am at HALF the mileage of most of you. I don't have a heavy foot, yes the car is tuned, and yet my mileage sucks eggs. Oh well, at least if I run out of gas and I'm on the side of the road, when someone helps me out, they can look at the pretty engine that's fuel starved!!
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Old 08-12-09, 02:24 PM   #14
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20 combined. Normal driving
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Old 08-12-09, 03:45 PM   #15
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20 more or less
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