lol..www.makan99.com..mine 2006 gen2..mine fulltank run 320km max..if always jam,city drive i might oni get to 270km..no idiea with this..>.<my meter 10.8-11.8 L per 100km.

i tried once , 60-70km/h , off aircond , no jam .. was on the highway . FC is around 4L/100km .

To www.makan99.com

Auto car always has higher fuel consumption compare to manual car. (no hard feeling, hazril).
KL road always has worst fuel consumption than outside KL.
Gen2 fuzzy logic uses first generation logic compares to cars developed in year 2008, which uses third generation logic (semi-automatic-trotonic gearbox, peddle shift etc).
KL road has alot of uphill-downhill climb (think highway ramp)
KL has road, NOT highway. When you drive 60km-per-hour on a up-down-3-lane-per-side, it is not a highway, it a road.

You think you have it bad? I used to pay RM90++ (when fuel was at $2.70) for a TOTAL of 250KM.

You want to save fuel?  Drive below 70km per hour.

Fuzzy logic gearbox enables me to outspeed and tailgates a lot of vehicles higher CC than me in highway and downhill. When other vehicle need to brake, I can go down the same road without the need to brake at all.

You want to save fuel? Understand the car or sell the car. 

All of your post is that you got the car for free, and complains bout fuel. Please start reading and research by using the search function/reading on V1 and V2 about the car.

Since this year, I have move from 60$ for 250KM to 60$ to 320KM on average.

IF you want 40$ for 500KM, dont drive in KL or go and drive other car. Proton Gen2 is never meant to be a fuel-efficient car. Proton Gen2 is meant to be a sport-friendly (superb, above average handling), performance-consciences vehicle. It is and I repeat, NOT a Honda City or Toyota Vios where fuel consumption is the top 3 conditions in their car design.

Best cost-effective method to save fuel = control your right leg. BUT as I say before "Drive slow in Gen2 EQUAL Extremely Boring".
Best method to save fuel = install some/all of the mod posted here. BUT it is not 100% fuel saving, rather I would call it Fuel-Performance-Optimizing

Fuel-Performance-Optimizing SAMPLE:
Stock design = Drive 100km-per-hour, use 36L of petrol, gain total milage 400km
Full Mod = Drive 100Km-per-hour, uses 36L of petrol, gain total milage of 500km
(or) Full Mod = drive 150Km-per-hour, uses 36L of petrol, gain total milage of 400KM

Personally, I havent install any mod, cause I'm a driver of the "(or) Full Mod" concept
P/S: To stop myself from being a jerk:

This is a pricelist from sometime in the year 2008. (Shazamn, sorry to copy your entire post  )

1. Large Snorkel increase ur pickup abit - RM80(PM me if u want it...can DIY)
2. Drop In Air Filter (K&N or Pipercross) paired with Large Snorkel further improve ur pickup - RM220-RM260
3. Extractor/Header (R3, Hotbits, Powerzone, Wegow) drastically improve ur pickup as it removes the catalytic converter - RM300 for R3 header...installation not included...can PM me oso...
4. Fuel Pressure Regulator (FPR) improve ur pickup and response (RECOMMENDED) - RM480 if do at my pomen's place in Seremban...other place in kl oso got but some members regret because no difference at all felt once install...still come to seremban...
5. Everco S-Flow Rear Muffler to get better top end - RM250 in Everco Sunway...if he said RM270 just insist on 250...they'll gave up eventually…
6. Midbox/Bullet depends on ur preference...midbox give better top end...bullet better pickup - RM100-RM200 depends on the brand...
7. Adjustable CamPulley - RM360 for item only...installation + tuning around 250 depends on the place u do it...
8. Lightened Crank Pulley - RM550++ for Mythelogy with Dampener and RM300+ for ayam brand without the dampener
9. Spark Plug Cable - RM200-RM700 depends on brand...expensive doesnt mean good...
10. Denso Iridium IT20/IT22 Spark Plug - RM160-RM180 depend on place u bought it...There's also Volker Iridium or NGK Iridium but Denso is the best so far...
11. Racing clutch - RM1000+ with installation
12. PnP - RM1000+ depends on the place and the 'stage' ure looking at...
13. Rebore the head with bigger piston - RM1000-RM2000+- depends on the place u do it and the stage ure looking at
14. Hi-Cam - RM2000+- with installation depends on brand an place u do it...
15. Final Drive (play with ur gearbox ratio) - RM2000+- with installation depends on brand an place u do it...
16. Still not satisfied? Change to MIVEC Gearbox with better overall ratio
17. Craving for more? Money is not a restriction to u? Convert to MIVEC or GSR...spare around RM20,000 for it...
New Update from me on #17 ... Personally, I rather "turbo-lized" or "CPS-lized" original Cam(tak)pro than to convert to MIVEC or GSR