leeb0672 Posted December 9, 2015 Share Posted December 9, 2015 Hi So recently my ford fiesta ecoboosts MPG has been dropping. Its went from approx 42.4 to now sitting at 39.6 . Really dont know whats up with it. If anyone has any idea why itd do this? Is it maybe needing serviced? Thanks ! Quote Link to comment Share on other sites More sharing options...
GingerFlame Posted December 9, 2015 Share Posted December 9, 2015 Cold weather? 3 Quote Link to comment Share on other sites More sharing options...
Preecematt Posted December 9, 2015 Share Posted December 9, 2015 As keiran says could be cold weather, the air is thinner this time of year so the car will be performing better 1 Quote Link to comment Share on other sites More sharing options...
Mordey Posted December 10, 2015 Share Posted December 10, 2015 Its the cold weather. My 1.6 goes from approx 36 during the summer down to below 30 in the winter. Seen it as low as 27 when really cold :( 2 Quote Link to comment Share on other sites More sharing options...
m1tch Posted December 10, 2015 Share Posted December 10, 2015 I know with diesel we get a double wammy of poorer fuel consumption due to the fact that it takes longer to get the engine up to temp, plus they tweak the blend of the diesel to stop gelling at lower winter temps. I am guessing that for you its the time taken to get up to temperature plus the additional engine load when using heated windows, lights and the blower settings. Not sure what the summer MPG will be on my 1.4 tdci but its currently on around 60mpg, thinking it should increase to mid to high 60s in the summer. 1 Quote Link to comment Share on other sites More sharing options...
Preecematt Posted December 10, 2015 Share Posted December 10, 2015 Glad to see I'm not the only one with a 1.6 that has astronomical fuel use, got mine down to 31.8 at the moment. 297 miles off a full tank of Vpower, Quote Link to comment Share on other sites More sharing options...
redordeadly Posted December 10, 2015 Share Posted December 10, 2015 My 1.0 140 was averaging about 44mpg over the warmer months but its now dropped down to 38-39 which is pretty pants ! But I only do very short start stop journeys and can't help but drive it nippily some times :) So all in all its not to bad I suppose - I've had faster cars (Leon FR 2.0) that won't reach 30 mpg when its cold.. Quote Link to comment Share on other sites More sharing options...
alexp999 Posted December 10, 2015 Share Posted December 10, 2015 Consider all of yourselves lucky. My last fill up worked out at 25MPG. And the next will probably be even worse as it has got colder since, lol. Cold weather makes the biggest difference on short journeys as you never get the car up to temp so it uses a ton more fuel. I've been sacrificing using the blowers on short journeys to allow the engine to warm up more, lol. Quote Link to comment Share on other sites More sharing options...
leeb0672 Posted December 10, 2015 Author Share Posted December 10, 2015 The weather makes sense! thanks guys!! Quote Link to comment Share on other sites More sharing options...
David73 Posted December 11, 2015 Share Posted December 11, 2015 So recently my ford fiesta ecoboosts MPG has been dropping. Its went from approx 42.4 to now sitting at 39.6 . Really dont know whats up with it. That could be natural variation of the petrol. The specific gravity of petrol has a legally permitted variation of +/-4%. Petrol is not actually octane (C8) but a blend of C3 to C15 so it is a product of natural and refining variations. But the calorific value remains constant by weight and the ECU maintains mass flow to the engine by adjusting the volume flow. The problem is that consumer measurements are done by volume. Quote Link to comment Share on other sites More sharing options...
E5GDM Posted December 12, 2015 Share Posted December 12, 2015 David73 ''The specific gravity of petrol has a legally permitted variation of +/-4%. Petrol is not actually octane (C8) but a blend of C3 to C15 so it is a product of natural and refining variations. But the calorific value remains constant by weight and the ECU maintains mass flow to the engine by adjusting the volume flow. The problem is that consumer measurements are done by volume''. That cleared that up 😗 Quote Link to comment Share on other sites More sharing options...
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