Fuel economy upgrade calculator

Savings from a more efficient car.

Built and reviewed by Dovanic, Founder and editor, FreeByteLast reviewed: 2026-08-18

Miles per year

Current mpg

New mpg

Fuel price

Yearly saving

$774

Over five years

$3,868

With these inputs, yearly saving comes to $774. Over five years works out to $3,868.

What moves the number · Yearly saving

Input	−10%	Now	+10%
Miles per year	$696	$774	$851
Current mpg	$1,007	$774	$583
New mpg	$626	$774	$894
Fuel price	$696	$774	$851

Whatmakesequal

Save this set of inputs, change something, then save again to compare the outcomes side by side.

Savings from a more efficient car.

With the defaults above, yearly saving works out at $774.