Jamesy Posted July 7, 2009 Share Posted July 7, 2009 Right this is prob a stooopid question but i've gotta ask it I wanted to know the best driving style to get the best fuel economy (yeah i know the first answer...DONT buy a Supra!) Now i know that the slower you drive the less fuel you use, BUT my question is if you drive really slow and always keep the revs between 1,500 - 2,000 ish will it actually use MORE fuel as you are straining the engine at constant low rpm? I'm sure i heard once if a car is driven at sub 1800 rpm its hard work fopr the engine. Or is this all a load of tosh? Cheers Quote Link to comment Share on other sites More sharing options...
michael Posted July 7, 2009 Share Posted July 7, 2009 Are you talking about a Supra here or just generally? Quote Link to comment Share on other sites More sharing options...
Jamesy Posted July 7, 2009 Author Share Posted July 7, 2009 Are you talking about a Supra here or just generally? mainly the Supra mate but a general overview would be handy.... Quote Link to comment Share on other sites More sharing options...
Havard Posted July 7, 2009 Share Posted July 7, 2009 Downhill with the clutch in..... For autos then just downhill.... Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted July 7, 2009 Share Posted July 7, 2009 http://www.racq.com.au/motoring_advice/about_your_car/car_factsheets/fuel_economy Quote Link to comment Share on other sites More sharing options...
tbourner Posted July 7, 2009 Share Posted July 7, 2009 http://www.racq.com.au/motoring_advice/about_your_car/car_factsheets/fuel_economy That suggests using cruise control though, which is terrible for fuel consumption! Quote Link to comment Share on other sites More sharing options...
martini Posted July 7, 2009 Share Posted July 7, 2009 The reason a good straight run on a motorway gets you the best MPG is because you are doing about 70 and don't stop. In town, even though you're using less fuel, the starting and stopping, foot-down moments all lead to more fuel going into the engine than is needed. Best tips? Trying to leave a large enough gap in front that if someone needs to slow down or stop that you are hardly effected. Some people talk about it here. Quote Link to comment Share on other sites More sharing options...
chp03bcd Posted July 7, 2009 Share Posted July 7, 2009 When i used to drive without exceeding 2000 rpm on the way to work i used to get nearly 30 mpg compared to 'normal' driving when it was more like 20 mpg. Extremely boring driving at 2000 rpm though. Quote Link to comment Share on other sites More sharing options...
martini Posted July 7, 2009 Share Posted July 7, 2009 Extremely boring driving at 2000 rpm though. God yes. You own a Supra! Quote Link to comment Share on other sites More sharing options...
Jamesy Posted July 7, 2009 Author Share Posted July 7, 2009 When i used to drive without exceeding 2000 rpm on the way to work i used to get nearly 30 mpg compared to 'normal' driving when it was more like 20 mpg. Extremely boring driving at 2000 rpm though. ahh so it does work to drive at the least rpm possible then. but yeah agreed its not really worth owning a Supra if your not even gonna let the 1st turbo have a little tickle!! Quote Link to comment Share on other sites More sharing options...
Jamesy Posted July 7, 2009 Author Share Posted July 7, 2009 (edited) http://www.racq.com.au/motoring_advice/about_your_car/car_factsheets/fuel_economy Good read, thanx. Out of interest, What PSi should i run in my 18" tyres please? Edited July 7, 2009 by Jamesy (see edit history) Quote Link to comment Share on other sites More sharing options...
Duffman Posted July 7, 2009 Share Posted July 7, 2009 That suggests using cruise control though, which is terrible for fuel consumption! Don't see how this could be. Why is cruise control terrible for fuel consumption...not continuously increasing/decreasing revs will benefit fuel consumtion surely Quote Link to comment Share on other sites More sharing options...
Jamesy Posted July 7, 2009 Author Share Posted July 7, 2009 i agree - CC is great on the motorway for fuel economy IMO Quote Link to comment Share on other sites More sharing options...
Lbm Posted July 7, 2009 Share Posted July 7, 2009 All the usual - accelerate gently, brake gently, don't drive more that 50-65mph - ever. Still think this is a good idea? Get rid of excess weight perhaps in boot etc. Walk more, use car less. Quote Link to comment Share on other sites More sharing options...
Jamesy Posted July 7, 2009 Author Share Posted July 7, 2009 Get rid of excess weight perhaps in boot etc. do i really need to get rid of my GIMP? he seems quite settled in the boot now where the space saver used to be!! Quote Link to comment Share on other sites More sharing options...
Lbm Posted July 7, 2009 Share Posted July 7, 2009 do i really need to get rid of my GIMP? he seems quite settled in the boot now where the space saver used to be!! MattH won't take it personally. Just leave him on the side of the road. Quote Link to comment Share on other sites More sharing options...
j1mb0b1 Posted July 7, 2009 Share Posted July 7, 2009 Give it full beans on the way to work, you get there quicker so use less fuel :p I get 40mpg like this hehe Quote Link to comment Share on other sites More sharing options...
Jamesy Posted July 7, 2009 Author Share Posted July 7, 2009 MattH won't take it personally. Just leave him on the side of the road. he will get the RIGHT HUMP mate. Quote Link to comment Share on other sites More sharing options...
Lbm Posted July 7, 2009 Share Posted July 7, 2009 he will get the RIGHT HUMP mate. Always pack both humps, or there will be trouble. Quote Link to comment Share on other sites More sharing options...
tbourner Posted July 7, 2009 Share Posted July 7, 2009 Why is cruise control terrible for fuel consumption...not continuously increasing/decreasing revs will benefit fuel consumtion surely i agree - CC is great on the motorway for fuel economy IMO Because it doesn't lift off downhill and it keeps power on uphill to maintain the speed exactly, you're better off easing off the throttle going downhill and maintaining speed roughly, maybe pick up a bit of speed, then slowing down slightly going uphill and accelerating gently on the flats. Quote Link to comment Share on other sites More sharing options...
stevie_b Posted July 7, 2009 Share Posted July 7, 2009 Also see "hypermiling": http://en.wikipedia.org/wiki/Hypermiling. IIRC some hypermiling techniques are impractical and/or dangerous on public roads, so you'd be wise to pick carefully the ones you'll use. Driving slower is not necessarily more fuel-economical. Manufacturers often say at what speed and in what gear the engine is most efficient: for a petrol car this is usually around 2500rpm in top gear. Keeping the car between 2000rpm and 3000rpm (petrol engines), accelerating gradually, not carrying around excess weight, and trying to smooth out the braking /accelerating cycles into a more uniform speed will all help. Quote Link to comment Share on other sites More sharing options...
nigelboyne Posted July 7, 2009 Share Posted July 7, 2009 try and skip gears 1 3 5 or 2nd 4th 6th. there is so much torque the car pulls in 6th at 30mph. very boring and only for city driving Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted July 7, 2009 Share Posted July 7, 2009 On the motorways slipstreaming a coach can add significant MPG, but you need to be uncomfortably close, and watch the water temps! Quote Link to comment Share on other sites More sharing options...
stevie_b Posted July 7, 2009 Share Posted July 7, 2009 (edited) Not stopping for red lights is also an excellent way to improve fuel economy! According to that wikipedia page (so it must be true), hypermiling can be done as a sport. A Honda Insight did 213mpg (yes, 213) on a round-trip somewhere in Indiana. Edited July 7, 2009 by stevie_b (see edit history) Quote Link to comment Share on other sites More sharing options...
tbourner Posted July 7, 2009 Share Posted July 7, 2009 I remember being told you should accelerate up to speed as quickly as possible, but keeping revs low, so foot down change gear low and get up to the limit asap. Quote Link to comment Share on other sites More sharing options...
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