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[tunnie]

Did a little test on last tank of LPG, set cruise bang on 65mph instead of the usual 80, over the course of 300 miles? Got almost exactly same mpg as i usually do, and pence per mile was 10.5 instead of 10.6.

Glad there is no saving as i was bored doing 65, and it was taking ages to get places 

Back to usual cruise speeds  8-)

[duggs]

Thank you Tunnie. VERY interesting post !  Honestly.

[Darth Loo-knee]

Tunnie lad you join my growing list of "Human Sleeping Tablets"

[PhilRich]

Did a little test on last tank of LPG, set cruise bang on 65mph instead of the usual 80, over the course of 300 miles? Got almost exactly same mpg as i usually do, and pence per mile was 10.5 instead of 10.6.

Glad there is no saving as i was bored doing 65, and it was taking ages to get places 

Back to usual cruise speeds  8-)

That is surprising, tunnie! I would have expected at least a noticeable increase in mpg? Still, in your case it's a plus point! 

[tunnie]

i thought it was interesting that fuel economy at 80mph is same as 65mph....

[tunnie]

Thank you Tunnie. VERY interesting post !  Honestly.

LPG conversion users will be interested 

[Darth Loo-knee]

i thought it was interesting that fuel economy at 80mph is same as 65mph....

I have noticed this before being honest.... I think it must be momentum

[tunnie]

i thought it was interesting that fuel economy at 80mph is same as 65mph....

I have noticed this before being honest.... I think it must be momentum

Revs were much lower, 2.7k ish, compared to 3.2k, so on a long motorway run, i would have expected it to be better.

There are some long hills, its 90% motorway, so would think it would be better. It did not 'feel' right, felt it giving more power on hills, usually at 80 just blasts up.

[Elite Pete]

Tunnie lad you join my growing list of "Human Sleeping Tablets"

I must admit, as soon as I saw Tunnie and LPG I thought not again

[Kevin Wood]

Did a little test on last tank of LPG.....

You need to test it over more than one tank, as LPG fills are not that consistent. Pumps are temperature compensated so if the temperature is different one fillup might not give you the same range as the next.

I tend to take the view that it's cheap therefore MPG doesn't interest me. Let the V6 growl away.

Kevin

[cem_devecioglu]

Did a little test on last tank of LPG, set cruise bang on 65mph instead of the usual 80, over the course of 300 miles? Got almost exactly same mpg as i usually do, and pence per mile was 10.5 instead of 10.6.

Glad there is no saving as i was bored doing 65, and it was taking ages to get places 

Back to usual cruise speeds  8-)

Tunnie , honestly I dont think this calculation reflects correct values.. 

the force you must spend increases  proportional with your speed squared in a fluid , called drag..

check drag at high velocity..

http://en.wikipedia.org/wiki/Drag_(physics)


 I guess some extra factors that Kevin mentioned mislead you..

[tunnie]

Did a little test on last tank of LPG, set cruise bang on 65mph instead of the usual 80, over the course of 300 miles? Got almost exactly same mpg as i usually do, and pence per mile was 10.5 instead of 10.6.

Glad there is no saving as i was bored doing 65, and it was taking ages to get places 

Back to usual cruise speeds  8-)

Tunnie , honestly I dont think this calculation reflects correct values.. 

the force you must spend increases  proportional with your speed squared in a fluid , called drag..

check drag at high velocity..

http://en.wikipedia.org/wiki/Drag_(physics)


 I guess some extra factors that Kevin mentioned mislead you..

Have been using same LPG pump, but i did notice same on petrol before, that there is very little difference in mpg at 65 vs 80.

If i push it to 90, it drops a lot, but 80 car just feels 'right' at that speed

[cem_devecioglu]

Did a little test on last tank of LPG, set cruise bang on 65mph instead of the usual 80, over the course of 300 miles? Got almost exactly same mpg as i usually do, and pence per mile was 10.5 instead of 10.6.

Glad there is no saving as i was bored doing 65, and it was taking ages to get places 

Back to usual cruise speeds  8-)

Tunnie , honestly I dont think this calculation reflects correct values.. 

the force you must spend increases  proportional with your speed squared in a fluid , called drag..

check drag at high velocity..

http://en.wikipedia.org/wiki/Drag_(physics)


 I guess some extra factors that Kevin mentioned mislead you..

Have been using same LPG pump, but i did notice same on petrol before, that there is very little difference in mpg at 65 vs 80.

If i push it to 90, it drops a lot, but 80 car just feels 'right' at that speed

this 'right' feeling is more like  I feel 'better' at higher speeds 

[Andy H]

Did a little test on last tank of LPG, set cruise bang on 65mph instead of the usual 80, over the course of 300 miles? Got almost exactly same mpg as i usually do, and pence per mile was 10.5 instead of 10.6.

Glad there is no saving as i was bored doing 65, and it was taking ages to get places 

Back to usual cruise speeds  8-)

Tunnie , honestly I dont think this calculation reflects correct values.. 

the force you must spend increases  proportional with your speed squared in a fluid , called drag..

check drag at high velocity..

http://en.wikipedia.org/wiki/Drag_(physics)


 I guess some extra factors that Kevin mentioned mislead you..

Drag is the major factor when cruising at motorway speed but I think the Omega is geared to hold the engine at the most efficient RPM when doing 80+ mph.

I do seem to get better MPG if I let the speed drift up in to that range....

[webby23]

I notice on our 2.6 that the mpg difference between 60mph and 75mph is minimal, so normally cruise at that higher speed