MPG: GT with Mods

rasermon · Post by **rasermon** » Sun Aug 24, 2003 12:38 am

The Ohio meet was my first long road trip with the vibe. I was surprise with the outstanding gas mileage I achieved. Here is the break down of my numbers.Home - topped off fuel tank. Trip A & B reset to zero.Columbus Oh. - 284.5 milesUpper Sandusky Oh.- topped off fuel tank with 8.6gal. 347.8 milesAverage mpg = 40.4Upper Sandusky Oh.- reset trip B to zeroHome Bay City Mi. - 220.7 topped off fuel tank with 6.2gal. Average mpg = 35.6Total miles - 568.5 (trip A)Total gas used - 14.8 (cost $27.97 USD.)Ave. mpg - 38.4Total driving hours - 10My returned trip home was less. Did 80 mph as soon as I reached the Mi. boarder, that seem to be the average speed on US-23 & I-75.

cohocarl · Post by **cohocarl** » Sun Aug 24, 2003 12:43 am

That's better than I get with my base!

KSNeptune · Post by **KSNeptune** » Sun Aug 24, 2003 4:04 am

That's the advantage of having a sixth gear. My old Nissan truck with a 5-speed can get better mileage than I've been able to get with my 4-speed auto Vibe on the highway.KSNeptune

Vibe · Post by **Vibe** » Sun Aug 24, 2003 6:14 am

I'll be driving to St. Louis ,MO. over Labor Day. It will be the first extended trip for my Vibe. Can't wait to see how my mileage is and to really shake her down. Results when I get back. James

cohocarl · Post by **cohocarl** » Sun Aug 24, 2003 6:45 am

quote:That's the advantage of having a sixth gear. Actually I believe the final ratio is a little lower in top gear in the 5-speed than the 6. A 5-speed in 5th traveling 70mph will be turning a few less rpm than a GT in 6th doing the same mph. The GT's 6-speed just has closer ratios and 1 more gear to get to same (or close to the same) final ratio. But I know what you are saying. I can get close to 25mpg in my 85 Vette that has approx 390ft/lbs of tq with the help of a 2.73:1 rear end. I'd REALLY like to replace it with a 3.54.

NovaResource · Post by **NovaResource** » Sun Aug 24, 2003 11:09 am

quote:Actually I believe the final ratio is a little lower in top gear in the 5-speed than the 6. A 5-speed in 5th traveling 70mph will be turning a few less rpm than a GT in 6th doing the same mph.Correct. A base 5-speed in 5th gear will have a lower RPM than a GT in 6th gear for the same speeds.

Triton · Post by **Triton** » Sun Aug 24, 2003 10:14 pm

Great gas mileage rasermon. I got around the same when I went to Indianapolis a few weeks ago.

JustinVGT · Post by **JustinVGT** » Mon Aug 25, 2003 1:13 am

Wow, that sure is some great gas mileage there Rasermon!

QUIKAG · Post by **QUIKAG** » Mon Aug 25, 2003 3:53 am

I've gotten close to 32mpg with my GT, only power mod is CAI. I was happy with that, 40 is incredible!!

rasermon · Post by **rasermon** » Mon Aug 25, 2003 11:27 am

Can lowering your vibe increase your gas mileage? I would think air would travel more over the top and less turbulence below.

MadBill · Post by **MadBill** » Mon Aug 25, 2003 12:14 pm

quote:Can lowering your vibe increase your gas mileage? I would think air would travel more over the top and less turbulence below. Yes it can, although not likely by more than an MPG or two. The air flowing under a car is usually so turbulent it blocks the airflow, it's like the car body extends all the way to the ground, so when you lower it, the frontal area gets smaller and it is the drag coefficent times the frontal area that determines most of the power needed to maintain highway speeds.

QUIKAG · Post by **QUIKAG** » Mon Aug 25, 2003 10:50 pm

quote:Can lowering your vibe increase your gas mileage? I would think air would travel more over the top and less turbulence below. It would help a bit, but the best thing I noticed about putting TRD springs on my GT is the very noticeable increased stability at speed. The car feels much more glued down on the highway at 80+mph.

rasermon · Post by **rasermon** » Mon Aug 25, 2003 10:58 pm

quote:The car feels much more glued down on the highway at 80+mph. You got that right!

MPG: GT with Mods

MPG: GT with Mods

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