sleepin gt Posted April 3, 2005 Share Posted April 3, 2005 im sure its passed through at least some of your minds so...if you happen to be bored, and are good with numbers, feel free to figure this out with me. If i can get a 6 speed for 3100 bucks, and i drive at 80 mph for 30 mins a day @ 3500k in 5th... and gas is 2.69 a gallon basically, how long would it take me to recoupe the money for the 6 speed, from the better gas mileage of having the 6th gear. Make up whatever mpg's you need...and anything else i cant think of. not that i think anyone will put in the effort, but good luck! LOL Link to comment Share on other sites More sharing options...
edmundu Posted April 3, 2005 Share Posted April 3, 2005 Here goes: 40 miles/day x 7 days = 280 week 5spd: 80@3335(rpm)= 24mpg ------ 6spd: 80@3225(rpm)= 27 280/24= 11.66 gal ------ 280/27= 10.37 gal 11.66-10.37= 1.29 gal Savings per week: 1.29 * $2.69= $3.47 $3100/$3.47= 893 weeks 893/52= JUST OVER 17 YEARS!!! Unless you need to be able to go 173 mph vs. 168 mph, or you need the strength, this is not ever going to be justified, at least not economically. Ps I had looked into this as well, until I find out the hard numbers. The 6 spd really isn't much of an advantage on the street, on the track different story. Link to comment Share on other sites More sharing options...
timbuktu Posted April 3, 2005 Share Posted April 3, 2005 im sure its passed through at least some of your minds so...if you happen to be bored, and are good with numbers, feel free to figure this out with me. If i can get a 6 speed for 3100 bucks, and i drive at 80 mph for 30 mins a day @ 3500k in 5th... and gas is 2.69 a gallon basically, how long would it take me to recoupe the money for the 6 speed, from the better gas mileage of having the 6th gear. Make up whatever mpg's you need...and anything else i cant think of. not that i think anyone will put in the effort, but good luck! LOL Interesting question, but you forgot to tell us the new ratio for the 6th gear. And what the gas consumption is at 80 mph. Lets assume for arguments sake that its 21 MPG @ 3500RPM @ 80 MPH. Also, lets assume that the sixth gear drops the revs to 3000RPM @ 80 MPH and that nets you 27MPG. So, you drive 40 miles/day (80 miles)/(1 hour) * (1 hour)/(60 min) * (30 min)/(1 day) So, with the imaginary sixth gear, you'd be burning 1.48 gallons per day, while currently burning 1.90 gallons per day. For you to make up $3100 (cost of a sixth gear), it would take you $3100/($1.90 - $1.48) = 7380.95 days which is equal to approximately 20 years Link to comment Share on other sites More sharing options...
sduford Posted April 3, 2005 Share Posted April 3, 2005 Also keep in mind that fuel consumption is much more closely related to HP being produced to maintain a certain speed then it is to RPM. So the fuel saving may not be nearly as big as you would think. Sylvain www.digitalfotographer.com - Audi Q5 Club - MB-GLK Club Link to comment Share on other sites More sharing options...
Gordon05GT Posted April 3, 2005 Share Posted April 3, 2005 Here goes: 40 miles/day x 7 days = 280 week 5spd: 80@3335(rpm)= 24mpg ------ 6spd: 80@3225(rpm)= 27 280/24= 11.66 gal ------ 280/27= 10.37 gal 11.66-10.37= 1.29 gal Savings per week: 1.29 * $2.69= $3.47 $3100/$3.47= 893 weeks 893/52= JUST OVER 17 YEARS!!! . My head hurts from all that math!! Link to comment Share on other sites More sharing options...
mikeh19372 Posted April 3, 2005 Share Posted April 3, 2005 If I was that worried about saving money on gas, I would have purchased the i, instead of the GT. If I'm looking at the 6 speed, it's for reasons other than improved gas mileage. Besides, worse comes to worse, if you're looking for all possible ways to save on gas, and your commute allows you to average 80MPH, just find a semi and do a little drafting... Link to comment Share on other sites More sharing options...
godwhomismike Posted April 3, 2005 Share Posted April 3, 2005 If I was that worried about saving money on gas, I would have purchased the i, instead of the GT. If I'm looking at the 6 speed, it's for reasons other than improved gas mileage. Besides, worse comes to worse, if you're looking for all possible ways to save on gas, and your commute allows you to average 80MPH, just find a semi and do a little drafting... If you really wanted speed and gas saving - you should have looked at a 6sp Mini Cooper S and enjoyed ~ 25 mpg mixed city/highway driving. Live and learn :lol: :lol: I'm enjoying an average of 17.7 mpg for mixed city/highway driving. - Mike Link to comment Share on other sites More sharing options...
axis008 Posted April 3, 2005 Share Posted April 3, 2005 I'm looking into ways to increase gas mileage, too, for the LGT. Yeah, some people will say why buy a performance car and so forth, but everyone has their own reasons. I have my own, as well. That being said, how easy do you think it would be to change the final drive ratio for better gas mileage? -ben Link to comment Share on other sites More sharing options...
Brady Posted April 3, 2005 Share Posted April 3, 2005 Umm ... I got a 10 spot that says your mileage would go down from the temptation to drive the poo out of the car with the new tranny. Link to comment Share on other sites More sharing options...
barnaby Posted April 3, 2005 Share Posted April 3, 2005 Not for nothing, but I have to give the 05 LGT 5AT pretty high marks. I drive around town during the week and highway on weekends, and I'm still hovering at around 24. Given that the car is so much fun to drive, I'm not complaining that it's 4mpg less than my 02 was. One question, if anyone would car to enlighten me, I've been using 93 as specified, instead of the 87 I used in the 02. Does it really matter? Thanks, barnaby Link to comment Share on other sites More sharing options...
Brady Posted April 3, 2005 Share Posted April 3, 2005 Barnaby ... YES it matters. The turbo pushes compression higher than the naturally aspirated engine allowing a higher rate of fuel combustion which yields power. 87 octane would predetonate (knock) which at best will decrease performance, and at worst will ruin your engine. If you want to learn more, there is a GREAT write-up on turbocharging cars and gasoline combustability versus compression over on Nasioc. Read this thread and learn! http://forums.nasioc.com/forums/showthread.php?s=&threadid=101967 Link to comment Share on other sites More sharing options...
Xenonk Posted April 4, 2005 Share Posted April 4, 2005 Here goes: 40 miles/day x 7 days = 280 week 5spd: 80@3335(rpm)= 24mpg ------ 6spd: 80@3225(rpm)= 27 280/24= 11.66 gal ------ 280/27= 10.37 gal 11.66-10.37= 1.29 gal Savings per week: 1.29 * $2.69= $3.47 $3100/$3.47= 893 weeks 893/52= JUST OVER 17 YEARS!!! Unless you need to be able to go 173 mph vs. 168 mph, or you need the strength, this is not ever going to be justified, at least not economically. Ps I had looked into this as well, until I find out the hard numbers. The 6 spd really isn't much of an advantage on the street, on the track different story. Dude, you forgot inflation of gas.. over a 17 year span where the average past 10 years is 3% inflation, I dont think he'll make the money back ever. Besides, the 1st 5 gears would eat up his fuel before getting the car to 80 mph at 3000 rpms. Answer: Never will make back up the cash for "investing" into a 6-speed. Keefe Keefe Link to comment Share on other sites More sharing options...
barnaby Posted April 4, 2005 Share Posted April 4, 2005 Brady, thanks. I'll stick with the 93. I've been using Sunoco, but does that matter? Link to comment Share on other sites More sharing options...
Sydsam Posted April 4, 2005 Share Posted April 4, 2005 I tried reading this question 5 different times and each time my mind completely wandered off right in the middle of it. Maybe I'll try again later. Link to comment Share on other sites More sharing options...
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