darchard

04 GS 300 I average 21 but have hit 24 mph on a tank of mostly highway driving.

eg92b16a2

I just picked up my 98 GS400 last friday. Drove from Ohio back to Kansas. Over 900 miles and i was getting 29 mpg doing between 70-75 mph...

jz4203

On my 98 GS400 which just turned 220k miles, I'm getting 25mpg mixed driving if I keep it to ~65-70 on the highway (w/no A/C). In winter with the heat on and driving slightly faster (~75mph) I get 22+mpg. This has been pretty consistant since I got the car at 156k.

TruPlaya26

iTrader: (4)

How are you guys getting such high mpg? I usually get 15 mpg if I'm lucky with mixed city/highway driving - '01 GS430

Rock-a-Lex

iTrader: (4)

+1...same here!

DetMich1

Mixed city highway driving I get 21-22 mpg.
Exclusive highway miles @ 78 mph on cruise control with A/C on, if I resist the temptation to stomp on the accelerator from time to time, I get 25 mpg pretty consistently.

MurdaInc

How The Hell Do U Get That Great Of Gas Mileage...all Im Getting On My Gs300 Is Like 270 To The Tank With Or With Out A/c....thats Driving Like A Granny...and Yes Im Using 91

Oleg400

iTrader: (7)

^^^X2 HOW!?!?!? i read alot of the earlier post( read all 14 pages) and i see some folks with a lot of hp mods and say they drive with a lead foot non stop and get 15-16 mpg with SC!?!?!?!?! wtf im getting 8.9-10 now that its really cold outside and i do drive it hard, but i tried driving it easy and got 14BARELY 14 it was average 13... wtf
99 gs400

j stuff

iTrader: (5)

after new spark plugs im getting 17mpg highway 15mpg city.. a lot of stop and start driving in houston tx

DetMich1

Well, other factors influence mileage besides how heavy your foot is. Tires/tire pressure, alignment, terrain, temperature, stop and go driving, length of trip, tune up status, etc. When I get my optimum mileage, its over a 175 mi course on an interstate highway. Driven durning off-peak traffic hours, on cruise control set at 78 mph. I resist the temptation to accelerate around slower traffic. I fill up a couple blocks before getting on the highway and then fill up again at the end of the trip a few blocks from the exit. The temperature is usually around 90-100 in the summer. It was about 68 today and overcast, even drizzled a bit at times. I keep my 18" Michelins inflated to around 38-40 psi. My tires are Hunter Road force balanced and the alignment is optimal. I do not carry much extra weight in the car. The route I described is fairly flat and only a few hundred feet above sea level. Once I get into overdrive, the transmission rarely downshifts from 5th gear and engine RPM stays at just under 2600. After 2hrs and 20 to 30 mins drivng, I refill the tank with 91 oct and it takes just 7 gallons. Hope that helps. If all other variables are equal, there must be something else accounting for your poorer mileage.

forteatwo

I drive my '04 GS300 primarily on the highway with cruise. I average 27 MPG at 73 mph (75 gets me a ticket...I've had three this year..off to driving school to buy back points). The GS gets better gas mileage if you use the cruise control. The gas pedal is very touchy which is to say, responsive and the mileage falls off quickly if you make lots of little adjustments in speed while driving. Remember the rpm's are fairly high on this car at cruising speed. A lot of these little adjustments in speed occur rather unconsciously when driving manually ie without cruise and the mileage falls accordingly.

I have gotten up to 28.5 mpg when forced to drive 60 mph, which is a real compliment to the aerodynamic efficiency of this model.

JRRRRRR

My '04 GS300 gets a whopping 30 (THIRTY) mpg on my bimonthly trek from Seattle to Montana. The cruise is set at 70 (75 in Idaho and Montana) and I have driven well over 400 miles on a tank. Of course, that spectacular performance has to be weighed against the nearly continuous stop and go here in Seattle, where I get about 22 - 24 mpg.

bpc23

iTrader: (2)

I just turned 25.1mpg, highway, unmodded GS400, 4 people, loaded trunk, Pennsylvania to Connecticut, some stop/go traffic, 75-80mph.

TruPlaya26

iTrader: (4)

About 90% stop and go traffic driving here in MIA and driving normal (normal=not aggressive, not grandma) i'll get MAYBE 260 mi. to the tank, that's barely over 15 mpg, what else can we do to improve these numbers? I need to know cuz it costs me $60 to fill up now

r0ng5

iTrader: (1)

The trip computer is pretty accurate for me. After one complete tank (the first tank, i wasn't paying attention), I drove 310 miles when the light came on and got ~20.5 mpg. I was actually surprised how low the mpg was, but it was dead-on with the trip computer.

I tried driving ~50 miles with "consumption" calculator turned on, and it's surprising how good the mileage is at when you're going 55 mph with cruise control on. I don't know how accurate that is though...