MPG... am I burning/wasting fuel?

Im wondering if my engine is working right... I filled up gas (full) and reset the trip meter... Its hit 70 miles and Im already at half tank on the gas needle... am I wasting gas? The car has driven about 30 miles in traffic and about 40 on the highway with a total of about 5 starts..

Should I be worried or is this normal mileage?

 

FYI: There is no smell of gas in the passenger area or near the exhaust (not that I can smell atleast)...

 

In traffic the 355 can be very poor but also the gauge is not very accurate / linear so there's no way short of refilling how much you've really used

 

I find not much diff driving in traffic or really going for it at speeds above 100mph in terms of milege. Full tank till warning light gives me approx 320km or about 200 miles.

 

There is no way you should be getting only 70 miles on a half tank.

 

Are you sure you had a full tank?

How many gallons did you get at the gas station?

Nearly impossible to get less than 10 mpg.

Kai

 

I get over 300 miles out of a tank full in my 348 with mixed driving. I assume the 355 is similar. I even got 250 miles out of a tank that included a (limited) track day and the subsequent race home.

 

10.9 (11.1 F1) MPG City, 18.7 MPG Highway (17.3 F1).
It's a very thirsty car. Mfg specs are always higher than real world. 10 MPG would be normal city.
Tank holds 21.7 Gallons. Half a tank at 17 mpg would give ya about 184 miles.

 

The gauge is not very accurate. If I fill up it takes alot of driving to get to the half way mark on the gauge but once it hits the half way it goes to empty fast.

 

I get between 290-300 too, same driving habits as yours.

 

I get a real 21-22 MPG on interstate cruises.
I get a real 5-6 MPG at the race track.
I have driven 331 miles on a single tank of gas, and I have gotten as little as 99 miles.

Its all in how you use the go pedal, and a bit on how you use the whoa pedal.

{I don't drive in the city so I have no idea what the milage would be there.}

 

I get around 320-330 miles per tank when the low gas light comes on. I do mostly freeway driving though.

I second everyone that the gauge needle is not linear. Track how many miles you get to a full tank for a few tanks then report back.

 

Worst I got was 7 MPG and best was 16 MPG. Guess my right foot may be a tad on the heavy side but it makes me smile ;-)

 

I find fuel economy in my 348 is directly related to what gear I spend most of the tank in. Enthusiastic 2/3 gear can get to single digit mpg. 5th gear highway cruising is usually around 24mpg (Canadian gallons).

haven't done flat highway for a long time, can't remember.

Sounds like you didn't get a full tank of fuel?

 

Interesting!
I asked for a full tank (full service ) and saw the guy wait for the pump to basically stop when its full, plus the guage showed it at full so I am assuming it was a full tank - the actual fill was about 55 Liters, and the light had lit up maybe 5 miles before I filled her up...

I will keep a track of mileage/fuel pumped/ and keep this thread posted as I go...

IF there is an excess of fuel usage, should I be worried??

ALso, I hooked up the scanner while driving to get an idea of MPG - acceleration (1,2,3rd gears) was around 5 MPG, cruising on the highway was around 14-15MPG (once into 4th, 5th) and peaked at about 17MPG in 6th... this is based on me driving, changing F1 gears, and trying to keep an eye on my laptop with the dashboard on real time info - anyone know how to record/log this so I can actually drive and study the data later?

 

Now I'm curious. I'll monitor my usage. Taking a road trip to Danville, Ca. this weekend should give me some HWY MPG.
Now I know why the "green" hybrid guy went bizerk on me in the Trader Joes parking lot when he saw the F car.

 

Which is especially hilarious when one considers that those lovely batteries in green cars will do a heck of a lot more to the environment than a little bit of CO2 will...

 

I do 348km on a full tank mixed driving

 

If only driving in city traffic I sometimes only got 100 miles out of a tank ( RHD car c 60L fuel tank)

 

348 mileage is vastly better than the 355. You'd be amazed how much fuel you burn at 8500 rpm when you cool the cylinders with gas.

 

Just took this pic today. Light came on after 310km (192miles) from a full tank and just about all city driving. Thing is: even filling up with the light on allows only at very very best 60litres (15.8US Gall). Saw an earlier post that someone gets only 55litres so I assume all is normal?

I know the reserve is 20litres but is it right that the fuel gauge reads about 1/8 or slightly below (which is too close to E for me) and the car can supposely go on for quite a bit? Don't quite want to try running the car dry and getting air into the system but has anyone pushed it before?
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Same here.. any time I take a long road trip I measure my mpg and it's always right between 21-22. I live in a city so around town I get about 8-10 mpg though. The fuel light definitely comes on early, but 70 miles on half a tank seems a bit off.

 

OK... so finally did my first fill up since resetting the tripmeter... I will try and log my current MPG and total MPG in this thread...

Started: 0miles, full tank
1st Fill up: 150miles, 49L --> Car is US spec so the reading is in MILES and the gas stations fill upin L... hence the difference

Current MPG: 11.5 (at 3.788 L per US Gallon)
Total MPG: 11.5

 

What was your driving style for that tank?

I have seen the original EPA mpg rating for the 355 listed in different places (window stickers, gov websites, msn autos) anywhere from 10/14 city/hwy to 13/17 depending on the year and trans. If you are doing all city driving 11.5 mpg isn't that strange

 

Id say I did about 100 miles highway and 50 city...

Its a 98 355 F1 trans...