Miles per tank
Registered User
Joined: Jun 2023
Posts: 62
Likes: 20
Joined: Jul 2014
Posts: 13,832
Likes: 1,551
From: Chesterfield VA
Every time I've computed miles/gallon it comes out to about 27.5. With a 13 gallon tank that would be 357.5 miles per tank 
if I ran it dry which ain't gonna happen. I don't compute or even bother with this often but I usually refuel after about 250 - 270 miles and rarely put more than 10 or 11 gallons in the tank. Rarely drive in "city traffic."
Technique I learned for a consistent full tank for more accurate measurements is to (1) use the automatic fuel pump cutoff, (2) wait 30 seconds, and (3) use the automatic fuel pump cutoff again. Click - wait - click. To get fully anal use the same fuel pump.
-- Chuck
if I ran it dry which ain't gonna happen. I don't compute or even bother with this often but I usually refuel after about 250 - 270 miles and rarely put more than 10 or 11 gallons in the tank. Rarely drive in "city traffic."Technique I learned for a consistent full tank for more accurate measurements is to (1) use the automatic fuel pump cutoff, (2) wait 30 seconds, and (3) use the automatic fuel pump cutoff again. Click - wait - click. To get fully anal use the same fuel pump.
-- Chuck
Joined: Aug 2012
Posts: 8,760
Likes: 1,862
Joined: Oct 2006
Posts: 13,494
Likes: 71
From: Chiswick
I am supercharged with an aftermarket EMS, and I seem to average 20mpg give or take with just around town cruising and some shenanigans. When I'd put on OEM ECU and stock injectors - to pass inspection, - that average moved up to 23-24mpg.
Moderator
Joined: May 2014
Posts: 7,919
Likes: 2,489
I can confirm from track driving that top down creates a lot more drag, so I would suspect worse fuel economy top down vs top up. It is quite significant on track. Granted this will be more noticeable the faster you are driving.
Moderator
Joined: May 2014
Posts: 7,919
Likes: 2,489
I think my best was just over 300 but I do not make a point of getting close to running out That was pre karcepts tune. And since I am tuned on 93 now my choices of gas stations is smaller so I tend to fuel up way before it gets close to empty due to that. I want to say the last time I drove it more than an hour on the highway (3 hr trip each way) I was seeing about 26 mpg. But again, I am tuned, I ran half the trip top down and I had the wing on the car.
That was pre karcepts tune. And since I am tuned on 93 now my choices of gas stations is smaller so I tend to fuel up way before it gets close to empty due to that. I want to say the last time I drove it more than an hour on the highway (3 hr trip each way) I was seeing about 26 mpg. But again, I am tuned, I ran half the trip top down and I had the wing on the car.
Joined: Jul 2014
Posts: 13,832
Likes: 1,551
From: Chesterfield VA
Trip to and from Charlotte earlier this month averaged in the 27 - 28mpg range. Probably 550 miles for the weekend. Maybe 25% roof down. Whole trip back was roof up -- intermittent rain. (The new RE91RS tires did fine in the rain,)
I recall the roof down average was a couple mpg lower (25 - 26) when I recorded it on one of the Staunton VA mountain drives (OK, baby 4000' eastern mountains!).
-- Chuck
I recall the roof down average was a couple mpg lower (25 - 26) when I recorded it on one of the Staunton VA mountain drives (OK, baby 4000' eastern mountains!).
-- Chuck
