GC350z Posted June 25, 2007 Share Posted June 25, 2007 At the weekend I travelled home to visit my mother. 241.8 miles there and back according to the AA route planner. Fuel light was on on Friday night with the DTE showing about 20 in the tank so I put €30 in working on the assumption I’d have to put more in before returning to Dublin. €30 gave me 25.66 litres. On Sunday when returning to Dublin the price of fuel was way higher in Waterford so I decided to plough on and get fuel when I had to. DTE said something like 67miles in the tank. Not good when I had a journey of 120.9 to do. After passing the last gas station about two thirds of the way to Dublin I remembered I needed fuel. Then the light came on. So I decided to have a go at the Clarkson game of driving as far as possible with the light on. Using an online converter because I’m lazy I got a figure of 42.83 MPG. Oh yea before anyone says it was all on motorways, the total distance travelled on the M11 was 29.6miles. The rest was single lane and dualer. Shame I only get between 9 and 19 MPG in the city the rest of the week. Quote Link to comment Share on other sites More sharing options...
Rob_Quads Posted June 26, 2007 Share Posted June 26, 2007 I doubt the figure was that large at all. You have way too many unknowns to come up with a figure. The fact you filled up with the DTE saying 20 miles but then did not fill up till way beyond that and was supprised how far you got on the red light means you could have covered lets say another 40/50 miles. On such a small sample that could mean you actually got 10mpg less The only way to come up with any sort of reliable number is to work it out from a full tank. An empty tank can't be used as you never know how much there is in there as the DTE can't be trusted and the gauge is not accurate enough. Quote Link to comment Share on other sites More sharing options...
Pingu2 Posted June 26, 2007 Share Posted June 26, 2007 pretty sure its impossible to get 42mpg! you need to fill it up, drive, then fill up again to find how much youre really using! Quote Link to comment Share on other sites More sharing options...
Stew Posted June 26, 2007 Share Posted June 26, 2007 30+ is possible. I have acheived this on longer jouneys, 40+, not sure. Quote Link to comment Share on other sites More sharing options...
Ian Posted June 26, 2007 Share Posted June 26, 2007 I got 26 over 500 miles on sunday, pretty much all motorway driving Quote Link to comment Share on other sites More sharing options...
Beavis Posted June 26, 2007 Share Posted June 26, 2007 I got 33mpg once from Newcastle under lyme to Porthmadog Quote Link to comment Share on other sites More sharing options...
GC350z Posted June 26, 2007 Author Share Posted June 26, 2007 Of course the figure isn’t accurate but does go to show the reserve is big. I don’t think there’s any point in trying to get an accurate figure. With a full tank you add weight so why bother. I know for a fact I’ll never play that game again. The fuel pump became very audible and sounded like it was gasping. To make matters worse on the day a match had just ended in the city and I had to make my way through the crowds to get to the petrol station. I had all the electrics turned off, windows closed, car getting very hot, fans going almost constantly, was getting very twitchy, tapping my figures constantly, fuel pump complaining behind me, DTE showing “- - -“ for what seemed like forever. The last thing I wanted was to run out of gas, in my glorious sports car, in the middle of a crowd of people who were already all pointing and commenting at the car. When I did get to the petrol station and removed the cap the air pressure blasted out of the tank. Never again. Quote Link to comment Share on other sites More sharing options...
jonathan73 Posted June 26, 2007 Share Posted June 26, 2007 I made the effort of zeroing the mpg/ave speed guage this weekend when going to Worcester.... Going there = 25.8mpg Ave Speed 64mph Coming back = 28.1mpg Ave Speec 61mph ALL Motorway driving. Mostly on Cruise Control. How the hell does anyone manage 30mpg+ I drove like a Saint. And NOT Simon Templar! Quote Link to comment Share on other sites More sharing options...
Beavis Posted June 26, 2007 Share Posted June 26, 2007 I made the effort of zeroing the mpg/ave speed guage this weekend when going to Worcester.... Going there = 25.8mpg Ave Speed 64mph Coming back = 28.1mpg Ave Speec 61mph ALL Motorway driving. Mostly on Cruise Control. How the hell does anyone manage 30mpg+ I drove like a Saint. And NOT Simon Templar! I can promise you Jonathan that the run to wales i can easily get 30+mpg, done it loads of times. Quote Link to comment Share on other sites More sharing options...
Stew Posted June 26, 2007 Share Posted June 26, 2007 I think the average speed says it all Jonathan. Probably a lot of slowing down and speeding up. That makes a negative effect on mpg. Quote Link to comment Share on other sites More sharing options...
jonathan73 Posted June 26, 2007 Share Posted June 26, 2007 No. No slowing down. A good, steady 80-90 all the way. Both directions. Quote Link to comment Share on other sites More sharing options...
Stew Posted June 26, 2007 Share Posted June 26, 2007 Hmmmm, how come the average speed was 60 ish then? Maybe a bit of town driving? I can get 30+ on a long journey. Quote Link to comment Share on other sites More sharing options...
Rob_Quads Posted June 26, 2007 Share Posted June 26, 2007 On a motorway journey with the cruise control locked on 80mph I can normally get around 30mpg. Slower and it can go up but I have never seen more than 34mpg out of a tank (i.e. some local driving + long motorway journey) Quote Link to comment Share on other sites More sharing options...
ByteJuggler Posted June 26, 2007 Share Posted June 26, 2007 ALL Motorway driving. Mostly on Cruise Control. How the hell does anyone manage 30mpg+ I drove like a Saint. And NOT Simon Templar! Yes, tis a mystery. What I've found is my wife is somehow capable of outperforming both me and the cruise at driving featherfootedly. I've not figured out how, but she manages to average around 30 pretty easily, where I with the best will in the world, can only get about 28.4 or so. Quote Link to comment Share on other sites More sharing options...
jonathan73 Posted June 26, 2007 Share Posted June 26, 2007 Granted Stew - I don't live on the Motorway so had to get there on 40 & 50mph roads which were about 25 of the 118 miles each way. Still disappointed though. If I have the patience then I may try cruise control at 70 and see if it gives a significantly better mpg Quote Link to comment Share on other sites More sharing options...
xStric9x Posted June 26, 2007 Share Posted June 26, 2007 I got 34.5mpg from Wrexham to Barmouth(spent 2 days there)and back again. Quote Link to comment Share on other sites More sharing options...
Jimbo Posted June 26, 2007 Share Posted June 26, 2007 Most of my miles are mototrway and I average about between 30 - 34MPG @ between 70 - 90MPH. When giving it beans round "B" roads and town driving I get about 16 - 20MPG. If your all getting crap MPG try re-setting your ECU`s especially if you have exhaust and filters on as the ECU can re- adjust fully to your mods. I know its a learning ECU but it will never give you the full benefits unless you do a full reset. Quote Link to comment Share on other sites More sharing options...
MAB Posted June 26, 2007 Share Posted June 26, 2007 Most of my miles are mototrway and I average about between 30 - 34MPG @ between 70 - 90MPH. When giving it beans round "B" roads and town driving I get about 16 - 20MPG. If your all getting crap MPG try re-setting your ECU`s especially if you have exhaust and filters on as the ECU can re- adjust fully to your mods. I know its a learning ECU but it will never give you the full benefits unless you do a full reset. I heard reference in another post that you can reset the ECU by use of the peddles. Could someone explain how this is achieved. many thanks mark Quote Link to comment Share on other sites More sharing options...
Ian Posted June 26, 2007 Share Posted June 26, 2007 Most of my miles are mototrway and I average about between 30 - 34MPG @ between 70 - 90MPH. When giving it beans round "B" roads and town driving I get about 16 - 20MPG. If your all getting crap MPG try re-setting your ECU`s especially if you have exhaust and filters on as the ECU can re- adjust fully to your mods. I know its a learning ECU but it will never give you the full benefits unless you do a full reset. I heard reference in another post that you can reset the ECU by use of the peddles. Could someone explain how this is achieved. many thanks mark The following is the correct procedure for resetting the ECU 350Z ECU Resetting Procedures Timing is extremely critical. If it is NOT DONE within the specify time, the ECU will not reset and the Check Engine Light (CEL) will continue to remain ON. A stop watch or an analog clock with a second?s needle will be useful. Operational Procedure 1. Confirm that accelerator pedal is fully released, turn ignition switch ?ON? and wait 3 seconds. 2. Repeat the following steps (2a and 2b) procedures quickly five times within 5 seconds. 2a. Fully depress the accelerator pedal (HARD). 2b. Fully release the accelerator pedal. 3. Wait 7 seconds**, fully depress the accelerator pedal and keep it for approx. 10 seconds until the CEL starts blinking. **The 7 seconds starts from the end of the 5 seconds period above it does NOT start from the 5th release of the accelerator pedal. 4. Fully release the accelerator pedal (while the CEL is still blinking) 5. Wait about 10 second. 6. Fully depress the accelerator pedal and keep it for more than 10 seconds. 7. Fully release the accelerator pedal (The CEL light will continue to blink but at a a faster rate). 8. Turn ignition switch to ?OFF? position and now you can start the car. The CEL light should be gone. If the CEL light continues to remain ON, repeat the above steps. Timing is EXTREMELY critical to resetting the ECU Quote Link to comment Share on other sites More sharing options...
MAB Posted June 26, 2007 Share Posted June 26, 2007 Thanks Ian- V Kind Quote Link to comment Share on other sites More sharing options...
Beavis Posted June 26, 2007 Share Posted June 26, 2007 Just reset mine because i have just fitted the JWT popcharger i had off madgrip. Reset no problem. Quote Link to comment Share on other sites More sharing options...
Removed Posted June 26, 2007 Share Posted June 26, 2007 30+ is possible. I have acheived this on longer jouneys, 40+, not sure. Chris driving from the Ring to Calais managed over 33pmg.... going at 55mph (the official excuse is that the weather wasn't good ) Quote Link to comment Share on other sites More sharing options...
MickJ Posted June 26, 2007 Share Posted June 26, 2007 Last journey to Kent and back I got 30 mpg according to the onboard and that was at 'around' the speed limit. Quote Link to comment Share on other sites More sharing options...
polarbear Posted June 26, 2007 Share Posted June 26, 2007 Really doubt 40+ mpg. I get around 29-30 on my daily work run (10 miles in town and 45 miles motorway) at a lazy "near limit" mph. Never seen more than 35mpg and that was in a long section of flat 50mph limit on the M4 in 4th/5th. The economy was worse at the same speed in 6th which is down to the engine not operating in an efficient range. Got that drive to work is boring Quote Link to comment Share on other sites More sharing options...
Sarnie Posted June 26, 2007 Share Posted June 26, 2007 You lot need to faster Quote Link to comment Share on other sites More sharing options...
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