StillLine

22.3 mpg average over 6,587 miles
93 octane, 10% ethanol blend
Mostly local cruising, very few road trips

lexixel

I saw 8.3 litre / 100 km (34 US mpg) this morning after resetting it (at gas station) and a 30 km trip averaging about 85 kph.

Then I had to park, and it went up to 8.4. On the way back, I put the top down, and when I got home it become 9.

The computer seems accurate, though. It read 10.1 before the last refill, and I added 32 litres for 319 km. It was on a road trip, though.

Prasha

my average of few years is 16.3 miles/us gal. My drive is 50/50 city/freeways. 245/35/20 tires

lexixel

Am I right to think that 245/35/20 is too large for this car? I would say 245/30/20 is a closer size to 245/40/18 stock.

texsexlex

iTrader: (3)

...not sure if they are running a staggered setup....but most of the drivers that have gone up to 20's are running 35 series tires & 30 series on rear, if they have a staggered fitment

Prasha

my is not staggered setup. I use super grade (91octane?)

Diameter inches (mm) 25.72 (653.2) ------ 26.75 (679.5) -------1.04 (26.3)------ 4% Difference

lexixel

I think 30 profile tyres will be 24.5 mm smaller in diameter, resulting in less than 0.3% difference from stock. Maybe the 4% difference is making your transmission to think you're always under load, leading to poor fuel economy.

Btw, my old, high mileage car with original oxygen sensors got about 10.1 l/100km (23 mpg) measuring from the pump today.

lexixel

Road trip last Saturday over ~ 500 km averaged 8.787 l/100km = 26.76 US mpg = 32.14 imp mpg. Top down most of the time; averaged 71 kph. Very economical for a petrol car.

tmakogon

Here are my 2005 SC430 numbers:

2016 Oct, 83°F air, with top up, filled with premium (US octane 93 = EU octane 98), Eighty-something thousand miles:
65 mph cruise flat road, Highway 290, 29.2 MPG, not touching brakes at all.
65 mph cruise hill country, Highway 6, 28.5 MPG, not touching brakes at all but driving in rolling hills (Texas).
city 20.5 mpg average over several years

2008 Dec, 45-50°F air, with top up, filled with premium, Something-Teen thousand miles:
Highway average speed 45 mph gets 32.5 mpg
Highway average speed 55 mph gets 27.5 mpg
Highway average speed 65 mph gets 25.0 mpg
city stop&go average speed 18.3 mph gets 16.5 mpg

Looks like over time gas mileage improved.

markfx

I get 19.5 with mostly city driving.
I was at 19.8 but then I began playing with the VSC and Power buttons...

tristankhine

Hi, I know this is a very very old thread but I will give it a shot.
Just purchased a Toyota Soarer 2002 and been playing with the car to test out the fuel economy. There are so few Soarer forum on web so I bet Lexus SC is a very close equivalent to the Soarer so.
My traffic condition is very similar to what you and Habious described. Its a 6 miles trip to work and took me 25 mins at best and 40-50 mins at worst to get to work. Traffic is very heavy, a real stop-n-go traffic. But the avg I am getting is 3.8km/L which translates to just 9MPG (US Gallon).

I am still collecting more miles to get the average more precise. Meanwhile posting here just to find out if these cars are real gas guzzler lol.
Looks like it is doing worse then my 2.7-ton LC200 2008 which is about 4.7lm/L same traffic conditions. I am gonna have to be very prepared haha.

SGB4570

Seems I'm normally in that 22 ish MPG on my 2004.

GregMN

2002 w/175k
7239 miles, 282.591 gallons, 25.62 MPG, $4.108 / gallon avg.

SGB4570

Wow, gas is high up there!

pynky01

I am not a mathematician. On a 700 mile trip : took the pump ticket and wrote mileage : dividing the miles by the gallons: i am somewhat aggressive in my driving; I always give the other driver the road.. = 28 mpg.. 2006 80K miles with all recalls.. and all major maintenance requirements. Live in a small town with few SC430's .. car at 18 yrs looks great inside and out.. in TEXAS you better have a V8 or you ain't TEJAS. Good luck to all and especially our country.. we are within the brink and I sit here..