my mate tells me if I drive at 2500 r/min, when on the motorway, this is good fuel economy. Its equates to 68mph. I drive a Rover 25 2.0 TD IE.
I can easily drive at 90mph but thats around 3000 r/min. By driving at 90mph & 3000r/min, am i using lots more fuel.
2006-09-19 00:56:54 · 13 answers · asked by howaytheladlee 4 in Cars & Transportation ➔ Maintenance & Repairs
62MPH is the figure your supposed to get your best fuel economy at now, but to improve your economy, the heater will increase your consumption by 15%, Air con by 20%, opening the windows by 5-10%, carrying excess weight is a real killer, and any form of drag such as roof racks won't do you any favours either.
In that car a useful thing to know is if you keep it in gear (top) when you coast up to junctions it will use NO FUEL at all. If you knock it out of gear it uses a little bit of fuel to keep the engine going, but if its in gear the cars momentum keeps the engine ticking over.
2006-09-19 12:16:19 · answer #1 · answered by Bealzebub 4 · 0⤊ 0⤋
You should be able to get an idea of fuel consumption from your handbook, but the higher the engine speed the higher the consumption, running at too low revs 1000rpm under engine load is inefficient as well. At higher speeds like 90mph friction increases fuel consumption also, wind resistance, rolling resistence (tyres etc.). But the difference may be only 7mpg at the speeds you state for a small diesel car with an unstressed engine. Turbo's help maximise efficiency also.
2006-09-19 01:03:41 · answer #2 · answered by strawman 4 · 0⤊ 0⤋
Highest gear, smallest throttle opening for the speed you want to travel at. Accelerate as slowly as possible as big throttle openings to speed up quickly use lots of fuel.
Basically least fuel is used by not starting the engine from then onwards more and more gets used.
Turning the engine off in traffic jams saves fuel very well as does avoiding stop start motoring as every time you accelerate most fuel is used and if you then have to brake it all turns into heat - easier said than done in this benighted country.
RoyS
2006-09-20 05:05:31 · answer #3 · answered by Anonymous · 0⤊ 0⤋
The faster you go the higher the revs and more fuel used. Depending on your vehicle 2000 rev/min is best. Better guide is to drive within speed limits,Usually best fuel economy on highways and safer although I will admit I cannot do that either
2006-09-19 01:06:52 · answer #4 · answered by mjdp 4 · 0⤊ 0⤋
Ive got a 205 gti if i go over 3000rpm you can watch the fuel gauge drop. A mate had the same problem with his civic. 2500 is hardly putting any pressure on the engine where as 3000 is half way there. dont know why they do use more fuel its only 500rpm but it does.
2006-09-19 07:35:50 · answer #5 · answered by craigs @ peugeot 3 · 0⤊ 0⤋
the best engine speed is the lowest that your car will cleanly pull top gear, normally this is around 2000 rpm which will probably be mid 50s. Your engine is torquey anyway, you are using much more fuel in travelling at 90, at least 20% more fuel
2006-09-19 01:26:56 · answer #6 · answered by Nimbus 5 · 0⤊ 0⤋
The speed you travel is important. The recommended speed for maximum economy is to drive at a constant 56 Mph for any vehicle. (road conditions favourable and legal of course!).
2006-09-19 01:43:33 · answer #7 · answered by Electra 2 · 0⤊ 0⤋
If you over-rev the engine you will waste fuel. Find the best cruising speed where the car feels happiest, that will be the most economical.
2006-09-19 01:09:49 · answer #8 · answered by jayktee96 7 · 0⤊ 0⤋
Where the torque curve peaks. Usually around 2200 RPM. At high speeds, the wind drag increases geometrically.
2006-09-19 04:34:58 · answer #9 · answered by RANDLE W 4 · 0⤊ 0⤋
have a look in your manufactures booklet they normally tell what your optimum speed is. i've started driving at 50mph and can get another 40 - 60 miles out of a full tank although its very boring.
2006-09-19 01:04:09 · answer #10 · answered by kunt 1 · 0⤊ 0⤋