Post by: applicationcen on January 05, 2018, 09:34:18 PM
Would one expect to refill from a brimmed full tank when the light goes on after only 255 miles?
seems to be drinking a lot of juice at that speed.
If the light comes on at 6 lites remaining, and say 4.5 litres per gallon, that’s about 36 mpg? What’s the thoughts of y’all?
ie is 255 miles a reasonable distance for a fully brimmed tanks at a speed of 85 mph?
Post by: Jocko on January 05, 2018, 10:35:41 PM
Post by: peteo48 on January 05, 2018, 10:51:10 PM
Post by: 123Drive! on January 05, 2018, 11:02:19 PM
Post by: applicationcen on January 05, 2018, 11:48:14 PM
The Legends lack of range / poor fuel efficiency was the reason I traded it in for the Jazz. At more than twice the tank capacity it managed a similar range on the motorway. I can’t remember getting more than 130 miles out of it around Torquay on a full tank!
The BMW averaged about 33mpg at 90 mph on motorway. I could reliably get 450 miles on a single tank on the motor way. The urban was about 140 miles
Post by: jazzway on January 06, 2018, 05:42:28 AM
It's the speed and right foot, 85mph is thirsty.
I hate speeding tickets, so 75mpg at a highway is my max. I am not a slow driver, never been, but looking ahead and anticipating (is also less braking) saves fuel.
Post by: culzean on January 06, 2018, 08:33:28 AM
How you drive has a marked effect on MPG, if I stay around 70mph in my Civic 1.8VTEC I can easily get from our house to Falmouth in Cornwall (about 300 miles) on about 2/3 tank- the Civic loves motorways, that is where a larger engine wins out, but local mileage I get high 30's low 40's mpg.
Post by: applicationcen on January 06, 2018, 09:36:58 AM
I filled the thank yesterday, 28 litre, as i always fill when its still about a quarter full. 450km (280 miles), 45mpg, mostly short town trips. When mostly rural and highway trips it's better.
It's the speed and right foot, 85mph is thirsty.
I used to dash about in the two bigger engined cars and NEVER got a ticket. Within 3 weeks for swapping for the jazz I got caught by a hand held camera!
I'm usually under 80, and the mileage is a lot better, just in to the 40's mpg from what the read out says.
Post by: JRHPNG on January 06, 2018, 10:11:20 AM
Post by: Hobo on January 06, 2018, 11:24:13 AM
Post by: madasafish on January 06, 2018, 02:03:28 PM
On long runs it easily averages 48mpg - depending on weather and traffic--- so roughly 350miles +40 reserve
Post by: Jocko on January 06, 2018, 02:29:16 PM
Post by: peteo48 on January 06, 2018, 05:08:58 PM
Lowest mpg remains at 33.8.
Post by: applicationcen on January 07, 2018, 10:06:32 PM
Interestingly the return trip was up at 45 mpg, and possibly a tad faster.
I’m guessing there is an overall incline that gets higher the further east you drive from Devon.
Those extended 50 mph segments with average speed cameras do wonders for economic driving, if nothing else:)
Post by: Jocko on January 07, 2018, 10:43:44 PM
Post by: peteo48 on January 07, 2018, 10:52:54 PM
Post by: John A on January 08, 2018, 06:42:43 AM
I’m guessing there is an overall incline that gets higher the further east you drive from Devon.
In my experience, headwind, or lack of or tailwind makes the biggest difference to consumption when driving at around 70mph.
Post by: Kenneve on January 08, 2018, 09:51:37 AM
Post by: culzean on January 08, 2018, 10:47:36 AM
I’m guessing there is an overall incline that gets higher the further east you drive from Devon.
In my experience, headwind, or lack of or tailwind makes the biggest difference to consumption when driving at around 70mph.
http://wikicars.org/en/Fuel_economy_in_automobiles
Above 30mph (average vehicle aerodynamics) wind becomes the dominant force for vehicle to overcome - and increase in drag is not linear increases rapidly as speed rises (drag proportional to square of speed), To get a feel for it drag your hand slowly through bath of water and then increase the speed and feel how much harder it gets as speed increases, air is less dense than water but behaves in pretty much the same way (the sound barrier is caused by air compressing in front of an aircraft when it cannot get out of the way quickly enough and it takes tremendous power to get through sound barrier, Concord was one of the few aircraft (including military planes) that could 'supercruise' - ie fly faster than speed of sound without using afterburners (or reheat as it is sometimes called) - it needed afterburners to get through barrier, but strangely did not need them afterwards - maybe flying at 60,000+ feet where air is thin had something to do with it).
Post by: Jocko on January 08, 2018, 12:09:55 PM
With regards to
Quote
As of this morning, my Mk3 EX has covered 12534 miles at an average of 51.8 MPG, (indicated) which on paper means I should be getting circa 450 miles per tank. I have to admit I very rarely see that sort of range, more generally it is around 375-400 miles between fill up.we seldom see what can be achieved on a full tank, as we never get right down to empty. There is still a load of fuel left when the warning light comes on, but I, for one, top up within a few miles of the warning light appearing.
Post by: Jocko on January 08, 2018, 12:28:46 PM
I doff my cap to you Jocko - you get fantastic figures.I try not to waste petrol. It is a game with me. When I bring the car out of the garage in the morning, the moment the front wheels are on the down ramp I switch off the ignition. When I start away I allow no warm up. I put the car in 1st, turn the key, and as soon as the engine fires the clutch is up and I am off. I seldom come to a complete stop in traffic, trying to keep the wheels rolling however slightly/slowly (you know how hard it is to push a stationary car but much easier once you get it moving). I switch the ignition off every time I get stopped at a set of traffic lights that I know will be red for a while (I drive the same routes day in and day out). I hang back as I approach every red light, hoping it will change in my favour, and treat every green light as if it will turn red as I reach it. It is pointless to accelerate to a green light as that is fuel you have wasted if it changes (or like so many other drivers, you continue on through the amber!). Before I pull away from parked I wait until the traffic clears so I just start and go. In a supermarket car park I drive into a bay where I can drive in and out in a forwards direction, even if it means a longer walk (supermarket trolley doesn't use petrol!). All these little tricks, used every time I drive, adds up to petrol saved and good mpg figures. Remember, most of my miles driven are in town and in traffic and the rest is on busy main roads.
Post by: peteo48 on January 08, 2018, 01:49:20 PM
Try to walk on the shorter trips although if my wife is with me we often take the car on account of her dodgy knees.